High-level language for specifying configurations of cloud-based deployments

ABSTRACT

A high-level object-oriented specification language allows configurable components of a cloud-based deployment to be modeled by a class definition that includes a group of configurable class parameters. The object-oriented specification language supports extension of an existing base class definition to create new class definitions, and supports inheritance of class parameters from the existing base class definition by the new class definitions. A cloud-based deployment can be customized based on class definitions used in configuring one or more generic deployments, such as by modifying class parameter values of the class definitions, varying interrelationships between the classes, and supplementing existing class parameters with new class parameters. The high-level object-oriented specification language supports class definitions that model hardware and virtual resources as well as software roles and service roles served by software applications and services in a cloud-based deployment. Syntax for specifying dependency and connectivity between classes is also provided.

RELATED APPLICATIONS

This application claims under 35 U.S.C. §119(e) the benefit of U.S.Provisional Application No. 61/453,478, filed Mar. 16, 2011, which ishereby incorporated by reference in its entirety.

BACKGROUND

This specification relates generally to cloud computing. Cloud computingis a computing model developed to enable convenient, on-demand networkaccess to a shared pool of configurable computing resources (e.g.,networks, servers, storage, applications, and services) that can beprovisioned and released quickly, dynamically, and with minimal manualmanagement efforts and human interactions with the service providers.

A few common cloud-based service models include, Software (e.g.,commercially-available software applications) as a Service (SaaS),Platform (e.g., hosting environment of software applications, such asvirtual machines or application frameworks) as a Service (PaaS), andInfrastructure (e.g., compute power, storage, database, networkingservices, etc.) as a Service (IaaS). Before a cloud-based service ismade available to a cloud-service customer, various aspects of theservice are configured according to a configuration specification, suchthat when the service is deployed, it meets the customer's needs andusage demand.

SUMMARY

This specification describes technologies relating to use and managementof cloud computing environments.

In general, one innovative aspect of the subject matter described inthis specification can be embodied in methods that include the actionsof: receiving a configuration specification for configuring acloud-based deployment, the configuration specification being written inan object-oriented specification language and requiring instantiation ofrespective class definitions of one or more classes, each class modelinga respective data or functional component of the cloud-based deploymentusing a group of configurable class parameters, and the respective classdefinition of each class representing a requested state of the data orfunctional component modeled by the class; deriving a plurality of APIcalls for configuring the cloud-based deployment based on the classdefinitions of the one or more classes; and causing the plurality of APIcalls to be executed to configure the cloud-based deployment.

In some implementations, the one or more classes include at least anexisting base class and at least a customized class extended from theexisting base class. The customized class inherits respective classparameters of the existing base class and the customized class modifiesa value of at least one of the class parameters inherited from theexisting base class or includes at least one new class parameter notpresent in the existing base class.

In some implementations, the data or functional component modeled byeach class is one of a virtual device supporting a cloud-basedenvironment, a service utilized in the cloud-based environment, asoftware role performed by an installed application in the cloud-basedenvironment, a data package holding data to be used during deployment oroperation of the cloud-based environment, or a combination of one ormore thereof.

In some implementations, the object-oriented specification languagesupports dependency between class definitions, and a definitiondependency between a first class and a second class represents adeployment dependency between respective components modeled by the firstand the second class.

In some implementations, the definition dependency between the firstclass and the second class is expressed by a class parameter of thefirst class where the class parameter of the first class refers to aninstance of the second class.

In some implementations, the object-oriented specification languagesupports connectivity between class definitions, and a value assignmentlinking an instance of a second class to a class parameter of a firstclass represents a connectivity between respective components modeled bythe first class and the second class.

In some implementations, the methods further include the actions of:identifying, based on the respective class definitions of the one ormore classes, a plurality of data and functional components modeled bythe one or more classes, and one or more dependency and connectivityrelationships existing among the plurality of data or functionalcomponents; and deriving a block diagram of a cloud-based environmentbased on the identified plurality of data and functional components andthe identified dependency and connectivity relationships.

In some implementations, deriving the block diagram further includesrepresenting trigger events for dynamic reconfiguration of thecloud-based environment in the block diagram.

In some implementations, the methods further include the actions of: foreach of the one or more class definitions: identifying an aspect of thecloud-based deployments that are influenced by the class definition interms the respective initial configuration state of the aspect;monitoring one or more performance metrics associated with theidentified aspect; associating the one or more performance metrics withthe class definition; and utilizing the one or more performance metricsin calculating a quality metric of the class definition.

In some implementations, the methods further include the actions of:identifying a plurality of cloud-based deployments each having beencarried out according to a respective configuration specificationwritten in the object-oriented specification language; identifying atleast one base class whose class definition is used in multiple of theplurality of cloud-based deployments; monitoring respective performanceof each of the multiple of the plurality of cloud-based deployments; andcalculating a quality metric of the at least one base class based onaggregated performance of the multiple of the plurality of cloud-baseddeployments.

In some implementations, the respective performance of each of themultiple of the plurality of cloud-based environment is a performanceassociated with a data or function component modeled by the at least oneclass.

In some implementations, the methods further include the actions of:storing respective class definitions of a plurality of core classes ofthe object-oriented specification language, each core classcorresponding to a modular component of a cloud-based environment, eachcore class being extendable with additional class parameters toconfigure the respective modular component; storing a mapping betweeneach of the core classes and a respective group of API calls, therespective group of API calls for configuring the modular componentassociated with the core class according to the class parameters of thecore class; and storing a plurality of protocols for modifying therespective groups of API calls associated with each core class to obtaina new group of API calls for a new class definition derived from thecore class.

In some implementations, deriving the plurality of API calls forconfiguring the cloud-based deployment further includes deriving theplurality of API calls based on the respective groups of API callsassociated with one or more of the plurality of core classes from whichthe one or more classes of the configuration specification are derived,and based on the plurality of protocols for modifying the respectivegroups of API calls.

In some implementations, the plurality of protocols further includesrules for imposing an ordering of the groups of API calls according todependency and connectivity relationships specified in class definitionswritten according to the object-oriented specification language.

In general, another innovative aspect of the subject matter described inthis specification can be embodied in methods that include the actionsof: receiving a respective definition submission from each of aplurality of definition suppliers, wherein the respective definitionsubmission includes one or more class definitions written in anobject-oriented specification language, and each class definition modelsa data or functional component of a cloud-based deployment using a groupof configurable class parameters and is extendable to create at leastone new class definition by a modification to one or more of the groupof configurable class parameters or an addition of one or more new classparameters; and providing a user interface that presents the classdefinitions received from the plurality of definition suppliers, forreview and selection by a plurality of definition users.

In some implementations, the methods further include the actions of:receiving a plurality of distinct configuration specifications writtenin the object-oriented specification language, the plurality of distinctconfiguration specifications each for configuring a distinct cloud-baseddeployment and including a distinct class definition that extends from asame one of the class definitions received from the plurality ofdefinition suppliers; and configuring each of the distinct cloud-baseddeployments based at least on the same one of the received classdefinitions and the distinct class definition that extends therefrom inthe distinct configuration specification of the distinct cloud-baseddeployment.

In some implementations, the methods further include the actions of: foreach of the received class definitions: monitoring usage of the classdefinition in a plurality of configuration specifications that have beenused to configure a plurality of cloud-based deployments; and recording,for each use of the class definition in the plurality of configurationspecifications, a credit to a definition supplier of the classdefinition and a charge to a definition user associated with the use.

In some implementations, the usage of the class definition includes aninstantiation of the class definition in a respective configurationspecification that has been used to carry out a respective cloud-baseddeployment.

In some implementations, the usage of the class definition includes anextension of the class definition to create a new class definition thatis instantiated in a respective configuration specification used tocarry out a respective cloud-based deployment.

In some implementations, the methods further include the actions of:receiving a software submission from a software supplier, the softwaresubmission including a software application to be deployed in acloud-based environment and a plurality of distinct configurationspecifications each for deploying the software application in thecloud-based environment in a distinct manner; and providing theplurality of distinct configuration specifications for review andselection by a software user.

In some implementations, the methods further include the actions of:receiving selection of one of the plurality of distinct configurationspecification by the software user; deploying the software applicationin the cloud-based environment according to the selected distinctconfiguration specification; and recording a charge to the software userand a credit to the software supplier based on a respective priceassociated the selected distinct configuration specification.

In general, another innovative aspect of the subject matter described inthis specification can be embodied in methods that include the actionsof: providing a plurality of class definitions for selection, each classdefinition modeling a respective data or functional component of acloud-based environment using a group of configurable class parameters,each class definition supporting instantiation and inheritance of theclass definition in a configuration specification for a cloud-baseddeployment; deriving respective performance metrics associated with eachof the plurality of class definitions based on aggregated performance ofmultiple cloud-based deployments, wherein the multiple cloud-baseddeployments had been carried out according to respective configurationspecifications that require instantiation of the class definition or anew class definition derived from the class definition; and utilizingthe respective performance metrics associated with each of the pluralityof class definitions in ranking the plurality of class definitions.

In some implementations, the methods further include the actions of:categorizing the plurality of class definitions based on the respectivedata or functional components of the cloud-based environment modeled bythe plurality of class definitions; and ranking the plurality of classdefinitions within the class definitions' respective categories.

In some implementations, providing the plurality of class definitionsfor selection further includes providing the respective performancemetrics with each of the plurality of class definitions for user reviewin a selection user interface.

In some implementations, the methods further include the actions of: foreach of the plurality of class definitions: identifying a plurality ofcloud-based deployments that had been carried out according torespective configuration specifications that required instantiation ofthe class definition or at least one new class definition derived fromthe class definition; monitoring respective performances of theplurality of cloud-based deployments; and associating the respectiveperformances of the plurality of deployments with the class definition.

In some implementations, deriving respective performance metricsassociated with each of the plurality of class definitions based onaggregated performance of multiple cloud-based deployments furtherincludes: for each of the plurality of class definitions: identifyingone or more data or functional components in the plurality ofcloud-based deployments that were configured according to the classdefinition or a new class definition derived from the class definition;identifying one or more performance metrics associated with theidentified one or more data or functional components; and deriving therespective performance metrics associated with the class definition byaggregating the identified one or more performance metrics.

In some implementations, the performance metrics include one or moremeasures of latency, reliability, scalability, availability, orsecurity.

In some implementations, the methods further include the actions of: foreach of the plurality of class definitions: tracking a respective countof cloud-based deployments that have been configured at least in partaccording to the class definition; and utilizing the respective countsassociated with the plurality of class definitions in the ranking of theplurality of class definitions.

In some implementations, the methods further include the actions of: foreach of the plurality of class definitions: tracking a respective countof problems encountered in cloud-based deployments that have beenconfigured at least in part according to the class definition; trackinga number of required changes to resolve the problems encountered in thecloud-based deployments that have been configured at least in partaccording to the class definition; and utilizing the respective countsof the problems and the respective numbers of required changesassociated with the plurality of class definitions in the ranking of theplurality of class definitions.

In some implementations, the respective numbers of required changesassociated with the plurality of class definitions are used to calculaterespective weights given to the respective performance metricsassociated with the plurality of class definitions in ranking theplurality of class definitions.

Other embodiments of this aspect include corresponding computer systems,apparatus, and computer programs recorded on one or more computerstorage devices, each configured to perform the actions of the methods.A system of one or more computers can be so configured by virtue ofsoftware, firmware, hardware, or a combination of them installed on thesystem that in operation cause the system to perform the actions. One ormore computer programs can be so configured by virtue havinginstructions that, when executed by data processing apparatus, cause theapparatus to perform the actions.

Particular embodiments of the subject matter described in thisspecification can be implemented so as to realize one or more of thefollowing advantages.

A high-level object-oriented specification language allows configurablecomponents of a cloud-based deployment to be modeled by a classdefinition that includes a group of configurable class parameters. Theobject-oriented specification language supports extension of an existingbase class definition to create new class definitions, and supportsinheritance of class parameters from the existing base class definitionby the new class definitions. An administrative user of a cloud-basedservice can customized a cloud-based deployment based on classdefinitions used in configuring one or more generic deployments, such asby modifying class parameter values of the class definitions, varyinginterrelationships between the classes, and supplementing existing classparameters with new class parameters.

The object-oriented specification language allows multiple layers ofabstraction to be made on the different types of cloud-servicecomponents that are configurable. For example, the high-levelobject-oriented specification language not only supports classdefinitions that model hardware and virtual resources, but also softwareroles and service roles served by software applications and services ina cloud-based deployment. In addition, the object-oriented specificationlanguage provides syntax for specifying dependency and connectivitybetween classes. Cloud components that involve multiple sub-componentsand complex structures can be modeled by class definitions that refer tomultiple types of base classes and specify respective interrelationshipsbetween the base classes.

A configuration specification can rely on existing class definitions toconfigure some aspects of a cloud-deployment at a high level ofabstraction, while customizing other aspects at a more detailed levelusing newly derived class definitions. An administrative user of acloud-based service is able to control the level of customization for acloud-based deployment by choosing an appropriate set of classdefinitions to include and instantiate in the configurationspecification for the cloud-based deployment.

In addition, the object-oriented specification language allows manyclass definitions that model common or special purpose cloud-servicecomponents to be created and stored. These stored class definitions canbe extended or reused as is in configuration specifications of futuredeployments by different cloud-service customers. This reuse of classdefinitions in specification configurations can improve the speed andefficiency of the deployment process.

Because class definitions can be reused and shared among manycloud-service customers, the efforts for developing suitableconfiguration specifications for the same or similar purposes do nothave to be duplicated by the cloud-service customers. A marketplace forsharing reusable class definitions can be developed, such that acloud-service customer can choose to purchase or license the use ofexisting class definitions developed and provided by other cloud-servicecustomers for a fee. In addition, software applications can be providedwith different types of configuration specifications (i.e., as“config-wrapped” software solutions) that are suitable for differentusage demands and organizational infrastructures of the cloud-customers.

When a configuration specification of a cloud-based deployment iswritten in the object-oriented specification language, the cloud-serviceprovider is able to parse the configuration specification to identifythe class definitions that are involved in configuring each data orfunctional component of the cloud-based deployment. Further, when thedeployment is carried out according to the configuration specification,the cloud-service provider is also able to identify the underlyingsoftware or virtual resources associated with each of the data orfunctional components of the deployment. Therefore, the object-orientedspecification language enables the cloud service provider to monitor theperformance of the data and functional components of the cloud-baseddeployment, and associate the performance with the class definitionsthat are used to configure each of the data and function components.Thus, the cloud-service provider can provide guidance to thecloud-service customers on which parts of the configurationspecification needs to be modified to improve the performance of thedeployment.

In some implementations, the cloud-service provider can generate a blockdiagram for the cloud-based deployment based on the configurationspecification. The performance of the different components of thedeployment can be visually represented on the block diagram. Variousreconfiguration triggers specified in the configuration specificationcan also be represented in the block diagram. This visual representationallows an administrator of the cloud-based deployment to adjust theconfiguration parameters of the deployment timely and appropriately.

The object-oriented specification language allows class definitions tobe reused in multiple configuration specifications, and potentially bymultiple cloud-service customers. The cloud-service provider can trackthe performances of multiple cloud-based deployments that have beenconfigured using configuration specifications involving reused classdefinitions. For each reused class definition, the cloud-serviceprovider can evaluate the quality of the class definition based on theaggregated performance of the multiple deployments that have beenconfigured using the class definition. In a marketplace for sharingreusable class definitions, a ranking or quality scores of the classdefinitions based on the quality of the class definitions can beprovided. This ranking or quality scores help cloud-service customers tobetter select the class definitions to reuse in their own cloud-baseddeployments. The ranking or quality scores may also help providers ofreusable class definitions to improve their class definitions.

The details of one or more embodiments of the subject matter describedin this specification are set forth in the accompanying drawings and thedescription below. Other features, aspects, and advantages of thesubject matter will become apparent from the description, the drawings,and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example cloud-computing environment.

FIG. 2A shows an example of a conventional configuration specificationfor a cloud-based deployment.

FIG. 2B illustrates a resulting topology of the cloud-based deploymentconfigured according to the configuration specification shown in FIG.2A.

FIG. 3A is an example configuration specification written in an exampleobject-oriented specification language.

FIG. 3B is an example module that includes reusable class definitionswritten in the example object-oriented specification language.

FIG. 3C is an example configuration specification that utilizes thereusable class definitions shown in FIG. 3B.

FIG. 4 is a block diagram of an example cloud-service manager of anexample cloud-service provider.

FIG. 5 is a block diagram showing a topology of an example cloud-baseddeployment configured according to the configuration specification shownin FIG. 3C.

FIG. 6 is a flow diagram of an example process for processing aconfiguration specification written in an object-oriented specificationlanguage.

FIG. 7 is a flow diagram of an example process for deriving a blockdiagram showing a topology of a cloud-based deployment based on theconfiguration specification of the cloud-based deployment.

FIG. 8 is a flow diagram of an example process for monitoringperformance of cloud-based deployments and associating the performancewith class definitions that are used in configuring the cloud-baseddeployments.

FIG. 9 is a flow diagram of an example process for evaluating thequality of a reused class definition based on aggregated performance ofmultiple cloud-based deployments that were configured at least in partbased on the reused class definition.

FIG. 10 is a flow diagram of an example process for deriving API callsfor configuring a cloud-based deployment based on class definitions usedin a configuration specification.

FIG. 11 is a flow diagram of an example process for providing a platformfor sharing reusable class definitions.

FIG. 12 is a flow diagram of an example process for configuring multipledistinct cloud-based deployments based on distinct configurationspecifications that all use at least one common reusable classdefinition.

FIG. 13 is a flow diagram of an example process for charging definitionusers and crediting definition suppliers based on usage of the reusableclass definitions provided by the definition suppliers.

FIG. 14 is a flow diagram of an example process for providing a platformfor selling “configuration-wrapped” software solutions.

FIG. 15 is a flow diagram of an example process for charging softwareusers and crediting software providers based on the selection ofconfiguration-wrapped software solutions by software users.

FIG. 16 is a flow diagram of an example process for utilizing aggregatedperformance metrics of multiple cloud-based deployments in rankingreusable class definitions that have been used in configuring themultiple cloud-based deployments.

FIG. 17 is a flow diagram of an example process for categorizingreusable class definitions and ranking the reusable class definitionswithin their respective categories.

FIG. 18 is a flow diagram of an example process for associatingperformances of multiple cloud-based deployments with a class definitionthat was used to configure the multiple cloud-based deployments.

FIG. 19 is a flow diagram of an example process for deriving performancemetrics associated with a reused class definition based on aggregatedperformance of multiple deployments.

FIG. 20 is a flow diagram of an example process for utilizing multiplefactors in ranking reusable class definitions.

Like reference numbers and designations in the various drawings indicatelike elements.

DETAILED DESCRIPTION

In a cloud computing environment, cloud-service customers (e.g., endusers or enterprises) obtain access to software, platform, and/orinfrastructure services through one or more networks (e.g., theInternet). The cloud-service customers are able to scale the servicelevel (e.g., in terms of service type, quality, and amount) up and downas needed, for example, through configuration user interfaces providedby the cloud-service providers, and/or through programmably-establishedconfiguration specifications stored at the cloud-service providers.Correspondingly, a cloud-service provider pools resources and serves itscustomers via a multi-tenant model, where physical and virtual resourcesare assigned and reassigned, configured and reconfigured according tocustomer demands. The locations of the physical resources underlying thecloud infrastructure are not exposed to the cloud-service customers andcan change dynamically.

FIG. 1 is a block diagram illustrating an example cloud-computingenvironment 100. In the example cloud-computing environment 100,cloud-service customers 102 communicate with a cloud-service provider104 using a customer device through one or more networks 106. Thecloud-service customers 102 include end users of software applicationsprovided by the cloud-service provider 104, such as in a “Software as aService” (SaaS) model. The cloud-service customer 102 can also includeenterprise customers that receive platform and/or infrastructureservices from the cloud-service provider 104, such as in the “Platformas a Service” (PaaS) and/or “Infrastructure as a Service” (IaaS) models.The software application services, platform services, and infrastructureservices provided by the cloud-service provider 104 are developed byin-house or third-party service developers 108, and made available tothe cloud-service customers 102 through the cloud-service provider 104.A cloud-service customer 102 may employ more than one type of servicesfrom the cloud-service provider 104.

In one example, the cloud-service provider 104 is conceptuallystructured in multiple layers. The lowest layer is the firmware andhardware layer 110 on which other layers of the cloud-service provider104 are built. The firmware and hardware layer 110 includes genericcontributing nodes (e.g., data centers, computers, and storage devices)geographically distributed across the Internet and provide the physicalresources for implementing the upper layers of the cloud serviceprovider 104.

Above the firmware and hardware layer 110 is the software kernel layer112. The software kernel layer 112 includes the operating system 111and/or virtual machine manager 113 that host the cloud infrastructureservices provided by the cloud-service provider 104. The software kernellayer 112 controls and communicates with the underlying firmware andhardware layer 110 through one or more hardware/firmware-levelapplication programming interfaces (APIs). The hardware/firmware-levelAPIs can be provider-specific and implemented to support HypertextTransfer Protocol (HTTP) and HTTP Secure (HTTPS) based communicationsprotocols. Examples of provider-specific APIs include Amazon WebServices APIs, Google App Engine APIs, and Microsoft SQL Azure APIs.

The infrastructure services provided by the cloud-service provider 104include virtualized resources, such as virtual machines, virtual storage(e.g., virtual disks), virtual network appliances (e.g., firewalls), andso on. The infrastructure servicers also include virtualized services,such as database services, networking services, file system services,web hosting services, load balancing services, MapReduce services,message queue services, map services, e-mail services, and so on. Eachof these infrastructure services can be employed by a cloud-servicecustomer 102 and deployed in an infrastructure service layer 114 abovethe software kernel layer 112.

The scale and various aspects (e.g., data, connectivity, and dependencyrelationships within and between service components) of aninfrastructure service deployment are configurable by an administratoruser of the cloud-service customer 102. In one example, theadministrator user submits a configuration specification to thecloud-service provider 104 via a frontend interface 120 of thecloud-service provider 104. The cloud-service provider 104 translatesthe configuration specification into instructions (e.g., API calls) tothe infrastructure service layer 114 and the kernel layer 112 accordingto the APIs of the involved infrastructure services and the APIs of theunderlying software kernel layer 112. These instructions are executed toprovision and configure the infrastructure services requested in theconfiguration specification of the deployment. For example, aconfiguration specification can be translated into infrastructure andkernel level APIs calls that create, re-create, move, or deletecomponents (e.g., virtual machines and services) and assign or changeattributes (e.g., memory and CPU allocations, network settings, disksizes and volumes) of the components.

In addition to the infrastructure services, the example cloud-serviceprovider 104 also provide platform services, such as an environment(e.g., Linux, Solaris, Microsoft Windows, etc.) for running virtualmachines or a framework (e.g., .NET, Java, Oracle Database, etc.) fordeveloping and launching a particular type of software applications. Theplatform services are implemented in a platform service layer 116 overthe infrastructure service layer 114, and can employ one or moreinfrastructure services configured in a particular manner. Configurationof platform services can be accomplished by program code writtenaccording to the APIs of the platform services and, optionally, the APIsof the infrastructure services that are employed in enabling theplatform services.

In this example, the cloud-service provider 104 also provides softwareapplication services in an application service layer 118. A softwareapplication (e.g., a commercially-available software application) can beinstalled on one or more virtual machines or deployed in an applicationframework in the platform service layer 116. The software applicationcan also communicate with one or more infrastructure service components(e.g., firewalls, databases, web servers, etc.) in the infrastructurelayer 114. The installation and configuration of the softwareapplication in the application service layer 118 can be accomplishedthrough APIs of the software itself and the APIs of the underlyingplatform and infrastructure service components.

To manage the deployment and operation of the cloud-based servicesprovided to the cloud-service customers 102, the example cloud-serviceprovider 104 includes a cloud-service manager 122. The examplecloud-service manager 122 communicates with the frontend interface 120to receive service requests from the cloud-service customers 102. Theexample cloud-service manager 122 is further responsible for themanaging of the cloud resources and services, including serviceenrollment, provisioning, coordination, monitoring, scheduling, etc. Asdescribed in this specification, the example cloud-service manager 122also includes tools and libraries for translating the user requirements(e.g., as expressed in one or more configuration specifications andservice level agreements (SLAs)) in the different service layers (e.g.,the layers 114, 116, and 118) into physical resources demands (e.g., asexpressed in one or more kernel and hardware/firmware-level API calls).

Although the example cloud-service provider 104 provides all three typesof cloud-based services, in some implementations, fewer or more types ofservices may be provided. In some implementations, the cloud-serviceprovider 104 may outsource some of the cloud services or portions of aservice to other cloud-service providers. The cloud-service manager 120may implement API calls to these other cloud-service providers forsupporting some of its services to the cloud-service customers 102. Inaddition, the conceptual layers of the cloud-service provider 104 shownin FIG. 1 are merely illustrative. Other conceptual structure of acloud-service provider may be provided, for example, depending on thetypes of services actually offered by the cloud-service provider.

In this example, the cloud-service customers 102 can employ cloud-basedservices offered in each of the services layers 114, 116, and 118.Depending on the type of services that a cloud-service customer 102 hasemployed, the cloud-service customer 102 is granted different levels ofcontrol in configuring the services. For example, if a softwareapplication service is employed, an administrator user of thecloud-service customer 102 is given control over how the softwareapplication is configured, but controls over the underlying platform andinfrastructure services supporting the software application remains withthe cloud-service provider 104. If a platform service is employed, anadministrative user of the cloud-service customer 102 is given controlover how the platform and/or application frameworks are configured, butthe control over the infrastructure services that support the platformand/or application frameworks remains with the cloud-service provider104. Similarly, if infrastructure services are employed, anadministrative user of the cloud-service customer is given control overthe particular infrastructure services employed, but not the underlyingkernel layer 112 and firmware and hardware layer 110.

In the cloud-computing environment 100, the cloud-service customers 102access the cloud-based services using data processing apparatus such aspersonal computers, smart phones, and tablet computers. Depending on thetype of service being employed, different user interfaces or programminginterfaces may be used to communicate with the cloud-service provider104.

For example, if a software application service is being employed, an enduser can access and use the software application through a web browser.If platform or infrastructure services are being employed, a user of theservice (e.g., an administrator user of a cloud-service customer 102)can access a configuration user interface that includes administrativefunctions to control and configure the services. The administrativefunctions include, for example, starting or stopping virtual machines,managing cloud storage, installing and deploying software on virtualmachines, or setting up web servers, etc. In addition, a cloud-serviceprovider 104 can optionally allow an administrator user of acloud-service customer 102 to write program code according to variousprovider-, platform-, framework-, and/or service-dependent applicationprogram interfaces (APIs) to control and configure various aspects ofthe services that the cloud-service customer 102 receives. In someimplementations, if an open standard is used for a cloud-computingenvironment, provider-, platform-, framework-, and service-independentAPIs can be used to control and configure the services as well.

When configuring a cloud-based service for deployment, a service user orservice developer provides one or more configuration files to thecloud-service provider 104. The configuration files set forth thedesired initial state of the service expressed in terms of variousconfiguration parameters. Typically, the configuration file is writtenin a structured way according to the rules and syntax provided orrecognized by the cloud-service provider 104, such that theconfiguration file will be parsed and interpreted correctly by thecloud-service provider 104.

FIG. 2A is an example of a conventional configuration specification 200for deploying a simple web application in a cloud-computing environment.The example configuration specification 200 is written in an ExtensibleMarkup Language (XML), which is a commonly used language for specifyingconfigurations for cloud-based deployments. The example configurationspecification 200 is provided to a cloud-service provider in a textfile. The cloud-service provider uses tools (e.g., a parser or APItranslator) that parse the configuration file according to the markups(e.g., the MXL tags, elements, and attributes, etc.) in theconfiguration file and converts the requirements specified in theconfiguration file into one or more sets of API calls. After theappropriate sets of API calls are determined, the cloud-service providerexecutes the API calls to carry out the deployment according to therequirements set forth in the configuration file.

FIG. 2B illustrates the resulting topology 208 of the web applicationservice after it is deployed according to the configurationspecification 200. First, according to the code block 202, a single GridService Manager (GSM) 210 is deployed on a single GSM virtual machine212. After the GSM 210 is deployed on the GSM machine 212, two GridService Containers (GSCs) 214 a and 214 b are deployed, each GSC on arespective GSC machine (216 a or 216 b), as specified by code block 204.Then, according to the code block 202, the GSM installs a copy of theweb application software (e.g., application copy 218 a or 218 b) withineach of the two GSCs 214 a and 214 b. According to code block 206, aload balancer service 220 is started on a load balancer machine 222, andused to direct traffic (e.g., HTTP requests from client browsers 224) tothe two GSC machines 216 a and 216 b, and to funnel back responsesprepared by the web applications running on the GSC machines 216 a and216 b.

As illustrated in FIGS. 2A and 2B, the example conventionalconfiguration specification 200 relies on nested markup constructs(e.g., code blocks 202, 204, and 206) to describe the components of adeployment and relationships among the components. The user writing theconfiguration specification 200 needs to be familiar with the detailswithin each markup construct that goes into the configurationspecification 200 and the markup construct's meaning to the APItranslator of the cloud-service provider. For a large and complexdeployment, the configuration file can become very long and complex withmany layers of markups and duplicate statements. Furthermore, thepossibility of code reuse decreases as a configuration specificationbecomes long and complex, because customization of the configurationspecification for another deployment would require many changes anddebugging the customized configuration file would also become moredifficult.

As disclosed in this specification, instead of providing a configurationspecification written in a markup language or through a graphical userinterface, a cloud-service customer or service developer can provide aconfiguration specification written in a high-level object-orientedspecification language. The high-level object-oriented specificationlanguage allows components (e.g., infrastructures, storage devices,services, software package to be installed, and “software roles” playedby installed software applications) of a cloud-based deployment to bespecified as instances of one or more reusable and modifiable classes,where each class models a component of the deployment using a group ofconfigurable class parameters. The value of each class parameter can bespecified, reused, or modified for particular deployments using thesyntax and functions provided by the object-oriented specificationlanguage. The instance of each reusable and modifiable class declaresthe desired state of the component that is modeled by the class.

As described in this specification, inheritance of class definitions issupported by the high-level object-oriented specification language. Newclass definitions can be provided based on statements relating ormodifying one or more existing class definitions using the high-levelspecification language. Statements relating different classes capturethe relationships between multiple aspects (e.g., data or functionalcomponents) of a deployment. Examples of such relationships include thedependencies between software installations and service activations in adeployment, the connectivity between multiple software roles in adeployment, and the connectivity between a software role and a serviceor virtual device in a deployment. New class definitions can also becreated by extending an existing class definition with the addition ofnew class parameters and/or methods. A user can customize a deploymentby specifying a new class derived from one or more existing base classesand instantiate the new class.

According to this specification, a cloud-service provider is able tocompile a configuration specification written in the high-levelobject-oriented specification language into a set of API calls, based onthe requirements specified by the class definitions included in theconfiguration specification. The inclusion of a class definition in aconfiguration specification refers to a request in the configurationspecification to instantiate the class definition or to instantiate anew class definition derived from the class definition.

In some implementations, different service layers of the cloud-serviceprovider and different services within the same layer have differentAPIs. To compile the configuration specification written in theobject-oriented specification language, the cloud-service providerstores a set of rules and protocols for translating each of a set ofmost basic class definitions (or core class definitions) of thespecification language to a respective group of API calls. The group ofAPI calls for each core class definition conforms to the API of the typeof components modeled by the core class definition. The compiler is thenable to use the set of rules and protocols to translate all classdefinitions derived from the core class definitions into an appropriatecombination of API calls to configure all of the components of aparticular deployment. In some implementations, the API calls are sentto and executed on one or more servers of the cloud-service provider.Alternatively, some of the API calls may be passed to an intermediarycomponent of the cloud-service provider or a third-party serviceprovider, where the API calls are further processed into lower-level APIcalls and carried out by the sub-components of the intermediarycomponent or third-party service provider.

In some implementations, the high-level object-oriented specificationlanguage also includes syntax for specifying triggers for scaling ordynamically reconfiguring various aspects of the deployment. Forexample, a class definition that models a virtual machine can includeone or more class parameters for a scaling policy, such that thecompiler can derive API calls to dynamically adjust the number ofvirtual machines deployed based on various performance metrics monitoredby the cloud-service manager (e.g., the cloud-service manager 122 shownin FIG. 1).

The following examples (shown in FIGS. 3A-3C) illustrate the syntax andvarious properties of an example object-oriented specification language,and how a cloud-based deployment can be specified according to theexample object-oriented specification language, and based on existingand newly derived class definitions.

In the first example, an example configuration specification 300 writtenin an example object-oriented specification language is shown in FIG.3A. The deployment made according to this configuration specification300 is for launching a virtual machine with a web server (e.g., anApache web server) installed and serving the files present in a datapackage.

This example assumes the existence of a number of base class definitionsthat the compiler is able to parse and translate to API calls. Theexisting base class definitions include a set of core class definitionsprovided by the compiler and possibly other class definitions thatextend from one or more of the core class definitions either directly orvia one or more intermediate class definitions.

In some implementations, the existing base class definitions are groupedinto modules (e.g., modules “utils,” “std” shown in FIG. 3A), andclasses included in each module are referenced in a configurationspecification by a module name followed by a class name (e.g.,“std.Parameters,” “utils.ConfiguratorLAMP,” “std.DataPackage,”“std.Role,” “utils.PublicTCPFirewall,” “utils.BaseDeployment” as shownin the specification 300). Each of the base class definitions specifiesan initial configuration state of a corresponding component of acloud-based deployment, subject to the modifications and componentrelationships set forth in the configuration specification 300.

As shown in FIG. 3A, the configuration specification 300 includes newclass definitions that extend from the existing base class definitions.For example, a new class “Params” extends from the base class“std.Parameters,” a new class “SimpleHostingPackage” extends from thebase class “std.DataPackage,” a new class “SimpleHostingVM” extends fromthe base class “utils.Configurator.LAMP,” a new class“SimpleHostingRole” extends from the base class “std.Role,” a class“SimpleHostingFirewall” extends from the base class“utils.PublicTCPFirewell,” and a class “SimpleHostingDeployment” extendsfrom the base class “utils.BaseDeployment,” as shown by the new classdefinitions 302, 304, 306, 308, 310, and 312, respectively. Theconfiguration specification 300 triggers the deployment of a simplehosting application by creating an instance of the“SimpleHostingDeployment” class (e.g., as shown by statement 314), whichin turn creates instances of other classes from which the“SimpleHostingDeployment” class is derived.

In this example, the “SimpleHostingDeployment” class definition 312customizes the definition of the base class “utils.BaseDeployment” bymodifying two class parameters, a “roles” parameter and a “firewall”parameter. The “roles” parameter specifies the respective software rolesthat one or more installed software packages are supposed to play in thedeployment. The “firewall” parameter specifies that a firewall serviceis to be included as part of the deployment. In this case, the classdefinition 312 specifies that a single software role is to be included,which is represented by an instance of the “SimpleHostingRole” class.The class definition 312 further specifies that the firewall service tobe included in this deployment is represented by an instance of the“SimpleHostingFirewall” class. According to the properties of theobject-oriented specification language, the “SimpleHostingDeployment”class inherits other class parameters defined in the base class“utils.BaseDeployment” without further modification. These other classparameters describe other aspects of the deployment that need not befurther customized for this simple hosting deployment.

According to the class definition 312, instantiation of the“SimpleHostingDeployment” class requires instantiation of the“SimpleHostingRole” and the “SimpleHostingFirewall” classes as well. Asshown in FIG. 3A, the “SimpleHostingRole” class definition 308 extendsfrom the base class “std.Role.” Both classes are based on a “softwarerole” model that categorizes a software installation according to therole that the software installation plays in a cloud-based deployment.For example, a software package may be installed to play a role of awebhost, a frontend, a backend, a communication interface, and so on.Depending on the particular role that a software installation plays,different parameters may be used to configure the software installation.Each configurable parameter for the software role can have acorresponding class parameter or function in the class definitioncreated based on the “software role” model.

In one example, in addition to an identifier or name of the role thatthe software installation plays in a deployment, a “software role” modelcan include model parameters for configuring various aspects of thesoftware installation, including the virtual machines on which thesoftware is to be installed, the location of the software binary,instructions on which installer program should be used to install thesoftware, and so on. If the software installation requires otherservices or software installations to be performed first, thisdependency is optionally included in the “software role” model as well.Example of dependency relationships are “start after” or “stop before.”Other dependency types (e.g., install on the same virtual machine, etc.)can be supported as well.

In this example in FIG. 3A, the class definition 308 for the“SimpleHostingRole” class specifies that the role of the softwareinstallation in the deployment is to serve as a “webhost.” How the“webhost” software is to be deployed is made known to the compilerthrough the class definition of the “simplehosting.webhost” class. Inthis example, the “simplehosting.webhost” class definition includes theconfigurations of a simple apache web server, which is already writtenand made known to the compiler. When the “SimpleHostingRole” class isinstantiated, the “simplehosting.webhost” class is instantiated as well.

The class definition 308 for the “SimpleHostingRole” class furtherdeclares that the data package that is needed to run this webhost isrepresented by an instance of the “SimpleHostingPackage” class, and thatthe webhost is to be installed on virtual machines that are representedby instances of a “SimpleHostingVM” class.

In this example, each of the “roleName,” “moduleName,” “dataPackages,”and “vms” are parameters of the “std.Role” class, and are customized inthe “SimpleHostingRole” class definition 308. Other class parameters ofthe “std.Role” class are inherited by the “SimpleHostingRole” classwithout modification.

The class definition 308 of the “SimpleHostingRole” class also defines afew new parameters, such as the “serving_domain” and “document_root”parameters whose values are assigned either indirectly through anotherparameter name (e.g., “serving_domain” of the “Params” class 302) or bya direct value entry (e.g., “/var/www/static”). In this example, onlyone software role is defined, so no dependency between software roles isspecified for the software role (e.g., the “SimpleHostingRole”) in termsof installation or execution.

With respect to the firewall component of the deployment, the classdefinition 310 of the “SimpleHostingFirewall” class is based on theexisting “utils.PublicTCPFirewall” class definition. In this example,the “utilis.PublicTCPFirewall” class defines a public firewall withTransmission Control Protocol (TCP) set as the protocol. The onlyparameters of the “PublicTCPFirewall” class that are modified for thisdeployment are the “target” and “ports” parameters. In the classdefinition 310, the target of the firewall is represented by an instanceof the “SimpleHostingRole” class, while the port of the firewall is setto port “80.” Other parameters (e.g., the “source” and the “protocol”parameters) that are needed to configure the firewall are specified inthe base class definition of “PublicTCPFirewall” and are inherited bythe “SimpleHostingFirewall” class without modification. In this example,a connectivity between the firewall component and the simple hostingsoftware role (e.g., represented by an instance of the“SimpleHostingRole” class) is specified by the value assignment to the“target” parameter.

In this example, the class definitions of the “SimpleHostingFirewall”and the “utils.PublicTCPFirewall” classes are both based on a firewallservice model. Unlike a “software role” model, a service model does notneed to include parameters for the underlying virtual machines, disks,or software packages. Instead, these aspects are controlled by thecloud-service provider and not subject to the configuration by the usersof the service. Like in a “software role” model, a service model alsooptionally includes parameters that specify dependences between servicesand between services and software roles. In this example, the firewallcomponent is connected to the web server component, but no dependenciesof the firewall service are specified for this simple hostingdeployment.

As set forth earlier and shown in FIG. 3A, the class definition 308 ofthe “SimpleHostingRole” class requires instantiation of the“SimpleHostingPackage” class and the “SimpleHostingVM” class. The classdefinition 304 of the “SimpleHostingPackage” class specifies the sourceof the data (e.g., “data” in the current directory”) that is to becopied to the virtual machine hosting the “SimpleHostingRole.” The classdefinition 304 further specifies a destination directory (e.g.,“/var/www/static”) of the copied data on the virtual machine. When thedeployment is carried out according to the configuration specification300, the data package “data” is copied from the directory in which theconfiguration file resides, to the destination directory“/var/www/static” on the virtual machine that has been deployedaccording to the “SimpleHostingVM” class definition 306.

As shown in FIG. 3A, the “SimpleHostingVM” class definition 306 extendsfrom the “utils.ConfiguratorLAMP” class definition. Both classes arebased on a virtual machine model and specify how a virtual machine canbe configured. In this example, the “utils.ConfiguratorLAMP” classconfigures a customized virtual machine that already has an Apache webserver installed. Therefore, by extending from the“utils.ConfiguratorLAMP” class rather than a standard virtual machineclass, a user can simplify and speed up the configuration process. The“SimpleHostingVM” class definition 306 also specifies the number ofvirtual machines to be deployed in this deployment and the external IPaddresses to be bound to the virtual machines, through the newly added“replicas” and “staticlP” class parameters. Other parameters that arecommonly used to configure a virtual machine or virtual machines forsupporting a software role include, for example, configurationparameters for the CPU and memory requirements of the virtualmachine(s), storage disks to be attached to the virtual machine(s),read-only storage sources attached to the virtual machine(s), IPaddresses, network interfaces of the virtual machine(s), the data centerlocation of the virtual machine(s), and so on. Each of these virtualmachine model parameters is optionally included as a class parameter ina virtual machine class definition or another class that extends from avirtual machine base class definition.

Optionally, a special “Params” class is included in the configurationspecification of a deployment, such as that shown in the exampleconfiguration specification 300. Parameter values can be provided inthis class definition and used to assign values to parameters in otherclass definitions that are included in the same configuration file. Forexample, the values of parameters “replica_count,” “serving_domain,” and“ip_array” are injected into the class definitions 306 and 308 throughreferences made to the respective names of parameters.

As illustrated in the example configuration specification 300, it ispossible to create class definitions for different components of acloud-based deployment based on different component models. A high-levelobject-oriented specification language can be developed based on modelsof various types of infrastructures, storage, services, and softwareroles that commonly occur in a cloud-based computing environment. Eachmodel describes a corresponding infrastructure component, storage,service, or software role using a number of model parameters. Core classdefinitions that represent generic initial configuration states of somemost common and basic components of the cloud-based environment can becreated based on these component models. As more complex components canbe built from combinations of multiple basic components, classdefinitions that represent the initial configuration states of morecomplex components can be created from multiple core class definitionsand/or other class definitions that are derived from the core classdefinitions.

A compiler of the high-level object-oriented specification language iscreated to parse the class definitions created based on these componentmodels, extract the configuration requirements expressed by the valuesof the class parameters, and translates the requirements into a properset of API calls for configuring the types of components represented bythese component models. In some implementations, a compiler isimplemented as a software program or script that reads a configurationfile and outputs a set of API calls. In some implementations, thecompiler also direct the API calls to appropriate components of thecloud-service provider or third-party providers for execution.

The example in FIG. 3A has illustrated class definitions developed basedon an example software data package model, an example virtual machinemodel, an example “software role” model, an example firewall servicemodel, and an example deployment model, respectively. As an additionalexample, an example storage model includes model parameters forconfiguring aspects of a storage option of a deployment, such as thesize of the storage, mounting points of the storage, and so on. In someimplementations, a storage model optionally includes a scaling policyfor dynamically adjust the size of the storage based on monitored usageof the storage. Furthermore, in addition to a firewall service, acloud-based environment can include many platform and infrastructureservices, such as a database service, a message queue service, a loadbalancing service, a map service, a MapReduce service, and so on.Different service models can be developed for each of these cloud-basedservices, and class definitions for configuring the different servicescan be created based on the different service models.

As illustrated by the example of FIG. 3A, an object-orientedspecification language enables the creation of class hierarchies thatrepresent different levels of customization for components in variouslayers of the cloud-computing environment. A configuration specificationwritten in the object-oriented specification language can reuse existingclass definitions, either by extending from an existing class definitionor referring to an instance of an existing class definition whenassigning a value to a class parameter. Reusing existing classdefinitions simplifies the configuration specification for a newdeployment. Furthermore, when reusing an existing class definition, auser only needs to know the configuration state that can be accomplishedby the existing class definition, but not all the literal details setforth within the class definition to accomplish that configurationstate.

In addition, class definitions of highly complex components (e.g.,components involving multiple services, multiple data sources, andmultiple levels of deployments) can be developed based on multipleexisting class definitions, with or without modification to the classparameters of the existing class definitions. These highly complex classdefinitions can be reused by a user in a new deployment, without indepth understanding of these complex class definitions on all levels.

By choosing the appropriate base classes to customize and modify in anew configuration specification, the user also gains more refinedcontrol over particular aspects of the deployment while leaving otheraspects of the deployment generic to definitions of the base classes.

FIG. 3B shows some base class definitions that are stored (e.g., in a“lamp” module 320) and reused in configuration specifications ofmultiple cloud-based deployments. These base class definitions aretailored for various Linux Apache MySQL Perl/Python (LAMP)-basedapplication deployments. Each class definition includes some commonlyused class parameters for configuring a respective data or functionalcomponent of a LAMP-based application deployment.

FIG. 3C provides an example configuration specification 340 thatutilizes the base classes in the “lamp” module 320 to deploy a Mantisdebugging software in a LAMP-based application deployment. By utilizingthe based class definitions in the “lamp” module 320, the configurationspecification 340 for the Mantis application deployment does not need toinclude the details of how a basic LAMP-based environment is configured,and only needs to customize aspects that are particular to the Mantisapplication deployment.

The following describes how the based class definitions in the “lamp”module 320 are used to establish a basic LAMP deployment structure. Inthe “lamp” module 320, the special “Params” class 322 includes someparameters that are used in multiple class definitions, such as a flag“single_node” indicating whether the Apache software and the MySQLsoftware should be installed on the same virtual machine, a“frontend_ip” parameter for specifying the IP addresses to be bound tothe LAMP frontend component, a “serving domain” parameter for specifyingthe domain name of the Apache website, a “doc_root” parameter forsetting the document root of the Apache server, a “mysqldatafolder”parameter for setting the database folder relative to the persistentdisk mount point, a “mysql_pdname” parameter for specifying the name ofthe persistent disk, a “mysql_pd mount_point” parameter for specifyingthe mount point of the persistent disk, a “pd_size_gb” parameter forspecifying the size of the persistent disk in GB. Optionally, theparameter values in the special “Params” class can be changed through acommand line tool provided by the cloud-service provider to make it moreconvenient for users to adjust deployments based on the “lamp” module.

A LAMP-based application deployment typically includes the followingcomponents: a frontend (i.e., the software role of a frontend softwareapplication), virtual machines on which the frontend softwareapplication (e.g., an Apache web server application) is installed, adatabase (i.e., the software role of a database software application),virtual machines on which the database software application (e.g., aMySQL software application) is installed, a permanent disk for storingthe database, and a firewall. Each of the above components is modeled bya respective set of class parameters that are configurable for aparticular LAMP-based application deployment.

As shown in FIG. 3B, the class definition “FrontendVM” 324 extends froman existing class definition “utils.ConfiguratorLAMP” which configures avirtual machine image that already has an Apache web server softwarepre-installed. In this case, the MySQL database software is to beinstalled on the same virtual machine as the Apache software, asindicated by the “single node” flag in the “Params” class definition322. Therefore, the “DatabaseVM” class definition 326 also extends fromthe class definition “utils. ConfiguratorLAMP.”

In the “lamp” module 320, the “MysqlPD” class definition 328 models thepermanent disk on which the database is to be stored. The MysqlPD classdefinition 328 includes class parameters that specify the name of thepersistent disk, the size of the persistent disk, and the mount point ofthe persistent disk, for example. Other parameters that specify how thepersistent disk should be configured are inherited from an existing“std.PersistentDiskSpec” class definition without modification.

The “FrontendRole” class definition 330 models the frontend component ofthe LAMP-based environment. The “FrontendRole” class definition 330extends from a standard software role modeled by an existing base classdefinition “std.Role.” The “FrontendRole” also refers to a “lampfront”placeholder class and a “lamp” placeholder module as the temporaryvalues assigned to the “roleName” and the “moduleName” class parameters.These temporary values will be replaced by the names of the actualmodule and class that configure the LAMP frontend software applicationto be deployed. As will be shown in FIG. 3C, the class definition thatconfigures the front end software (e.g., the Mantis debugging software)is the “mantis frontend” class in the “mantis” module. The classdefinition 330 also sets forth that the virtual machine on which theLAMP frontend role is to be installed is represented by an instance ofthe “FrontVM” class 324.

The “DatabaseRole” class definition 332 models the database component ofthe LAMP-based environment. The “DatabaseRole” class also refers to aplaceholder class in a placeholder module (e.g., “lamp” and “lampbackend”) for the backend software configuration. The names of theplaceholder class and the placeholder module will be replaced by theactual names of the class and module that configure the backend databasesoftware. The “DatabaseRole” class definition 332 also specifies thatthe persistent disk storing the database is represented by an instanceof the “MysqlPD” class definition 328. In addition, a “vms” parameter isdefined to indicate that the virtual machine for installing the backenddatabase software of the LAMP environment is to be represented by aninstance of the “FrontendVM” class if the “single_node” flag is set toTRUE, otherwise, the virtual machine is to be represented by an instanceof the “DatabaseVM” class.

Lastly, in the “lamp” module 320, the firewall component of theLAMP-based environment is modeled by the “HttpFirewall” class definition334. The “HttpFirewall” class definition extends from the existing“utils.PublicTCPFirewall” class definition, such as the protocol,source, and target parameters of the “util.PublicTCPFirewall” class areinherited by the “HttpFirewall” class. The “HTTPFirewall” classdefinition modifies the “port” parameter of the“utils.PublicTCPFirewall” from “any” to “80.”

Each class definition set forth in the “lamp” module 320 shown in FIG.2B is extendable, modifiable, and/or usable as is for anapplication-specific deployment and/or for creating new classdefinitions in other modules. The configuration specification 340 shownin FIG. 3C includes and builds upon the class definitions in the “lamp”module 320 shown in FIG. 3B. A statement 342 at the beginning of theconfiguration specification 340 points to a file containing the classdefinitions of the “lamp” module 320, to indicate to the compiler whereto locate the base class definitions that are used in the configurationspecification 340.

The configuration specification 340 is for configuring an applicationdeployment that launches virtual machines in a LAMP structure andinstalls the Mantis debugging software on the virtual machines. Mantisis a web-based bug-tracking system written in the PHP scripting languageand works with a MySQL database and a webserver.

As specified in the in the “MantisDeployment” class definition 354, thedeployment calls for two software roles and a firewall to be installed.In this case, the two software roles are created according to the“MantisFrontend” class definition 348 and the “MantisDatabaseRole” classdefinition 350, while the firewall is created according to the“MantisFirewall” class definition 352. When the configurationspecification 340 is compiled, the statement 356 makes an instance ofthe “MantisDeployment” class and causes the other classes on which the“MantisDeployment” class depends to be instantiated as well.

In this example, the “MantisFrontend” class definition 348 extends fromthe “lamp.FrontendRole” class definition 330 shown in FIG. 2B. The classparameters that are modified for the Mantis software installationinclude the “roleName,” “moduleName” of the software configurationspecification, the “dataPackages” from which the Mantis softwarebinaries can be copied, and the database host to be associated with theMantis application deployment. The configuration parameters for thevirtual machine aspect of the Mantis frontend are inherited from the“lamp.FrontendRole” class definition 332 without modifications. In otherwords, the user writing the configuration specification 340 accepts thedefault virtual machine configuration specified in the “lamp” module320, and needs not customize the Mantis application deployment with thatlevel of details.

Similarly, the “MantisDatabaseRole” class definition 350 extends fromthe “lamp.DatabaseRole” class definition 332 shown in FIG. 3B. The classparameters that are modified for the Mantis software installationincludes the “roleName” and “moduleName” of the configurationspecification for the backend database role. In addition, the frontendhost of the database role is set to be an instance of the“MantisFrontendRole” class. The configurations for the virtual machineaspect and the persistent disk aspect of the database backend role areinherited from the “lamp.DatabaseRole” class definition 332 withoutmodification.

In addition, the “MantisFirewall” class definition 352 inherits theparameters from the “lamp.HTTpFirewall” and modifies only the value forthe “target” parameter to an instance of the “MantisFrontendRole” class.Other parameters, such as the “port” and “protocol” parameters of the“MantisFirewall” class are inherited from the base class“lamp.HTTpFirewall” defined in the “lamp” module 320.

Other parameters and values specific to the Mantis deployment are setforth in the special “Params” class definition 344 and the data packagefrom which the Mantis software is copied is specified in the“MantisPackage” class definition 346.

In the above example, the configuration specification for the Mantissoftware deployment is derived from the base class definitions (e.g.,class definitions in the “lamp” module 320) created for a genericLAMP-based application deployment. Configurations of many aspects of theLAMP-based deployment do not have to be redefined for the Mantisapplication deployment. The configuration specification for the Mantisapplication deployment only needs to specify new parameters or newparameter values that are particular to the Mantis applicationdeployment or in need of customization. Parameters that are alreadydefined for other more generic aspects of the deployment do not need tobe re-specified or modified in the configuration specification 340. Thedetails of these other aspects of the deployment can remain opaque tothe user.

The examples shown in FIGS. 3A-3C are merely illustrative of theproperties of an object-oriented specification language for writingconfiguration specifications of cloud-based deployments. In variousimplementations, the exact syntax of the object-oriented specificationlanguage can depart from what is shown in the examples. Furthermore,many types of base classes can be created to model the components thatmay exist in a cloud environment. Syntax for specifying relationshipsbetween components modeled by the classes can also vary from oneobject-oriented specification language to another object-orientedspecification language. For a given object-oriented specificationlanguage, a compiler can be created to parse the class definitionsincluded in a configuration specification written in the object-orientedspecification language according to a predetermined set of syntax rulesto extract the parameters that are used to configure the various typesof components in the cloud environment.

FIG. 4 shows an example cloud-service manager 222 of an example cloudservice provider 104. The example cloud-service manager 222 isresponsible for deploying cloud-based services according to theconfiguration specification 104 provided by the administrative users 102of the services. The cloud-service manager 222 receives communicationsfrom the administrative users of the cloud-customers 102 through thefrontend 120 of the cloud-service provider 104. In some implementations,the cloud-service manager 222 may have its own frontend components thatcommunicate with the cloud-service customers 102 directly.

After the frontend 120 receives the configuration specifications 104from an administrative user of the cloud-service customers 102, thefrontend 120 passes the received configuration specifications 104 to anAPI translator 404 of the cloud-service manager 222. The API translator404 have access to a library of core class definitions (e.g., stored ina definition database 406) and translation protocols (e.g., stored in arule database 408) on how to translate the core class definitions intorespective sets of API calls for configuring various components of acloud-based environment of the cloud-service provider 104.

For example, the API translator 404 can include a compiler (e.g., aparsing script or program) that parses the class definitions received ina configuration specification 104, identify all the base classes fromwhich the classes in the configuration specification are derived, andextract the base class parameters that are left unmodified as well asthe class parameters that are modified or new. In addition, the compileralso identifies all the relationships (e.g., connectivity anddependencies) among the components of the cloud-based deployment fromthe statements in the class definitions. Based on the values of theclass parameters and the stored translation protocols, the APItranslator 404 generates an appropriate set of API calls 410 toconfigure various aspects of the cloud-based deployment.

For example, the translation protocols can include a mapping between acore class definition modeling a respective modular aspect of thecloud-based environment to a group of API calls that are used toconfigure that aspect of the cloud-based environment. The translationprotocols can further include protocols for modifying the set of APIcalls (e.g., changing default parameters used in the API calls) withparameter values specified for that modular aspect of the cloud-basedenvironment in classes derived from the core class definition.

As a more specific example, suppose a standard virtual machine classdefinition (e.g., a “std.VM” class) is a core class definition known tothe compiler. The compiler would have access to a translation rulemapping the core class definition to a set of provisioning API callsmade to the VM manager in the kernel layer of the cloud-service provider104 for deploying a standard virtual machine image. A default set ofparameters (e.g., duplicate count, IP address, memory requirement, etc.)can be used in the provisioning API calls. The protocol for modifyingthe API calls can include protocols for changing the default parametervalues according to the parameter values specified in the specificationconfiguration and in intermediate class definitions that are derivedfrom the standard virtual machine class definition. For example, if aclass parameter of a new class definition derived from the standardvirtual machine image specifies the software package to be installed onthe virtual machine image, the translation protocols would specify howthe additional API calls for installing software packages on adesignated virtual machine should be added to the group of API callsassociated with configuring the standard virtual machine image.

In some implementations, the protocols for translating class definitionsto API calls are written as program scripts. As new core classdefinitions are added to the class definition database 406, the protocolfor translating the new class definition can be created and added to thetranslation rules database 408. The translation protocols can becreated, for example, by the cloud-service provider 104. In someimplementations, when encountering a particular class definition inparsing a received configuration specification, the API translator 404locates and runs a corresponding script to parse the class definitioninto a set of API calls. The API calls, when executed, cause theconfiguration specified by the class definition to be achieved in thecloud-based environment.

In some implementations, the API calls 410 generated by the APItranslator 404 are sent to a service launcher component 412 of thecloud-service manager 222. The service launcher component 412 isresponsible for channeling the API calls 410 to various layers of thecloud-service environment or components of the cloud-service provider104 where the API calls can be executed. In some implementations, wherethe deployment are to be carried out in several stages due to thedependencies between various aspects of the deployment, the servicelauncher component 412 is also responsible in checking the order bywhich the API calls are sent out to the layers and/or components forexecution, and verify that the API calls have been completed in a propersequence.

Since class definitions written in an object-oriented specificationlanguage as disclosed in this specification can be reused in multipleconfiguration specifications, an administrator user of a cloud servicemay wish to employ class definitions provided by a third party (e.g.,another user, a service developer of the cloud-service provider, orthird-party developers) in their own configuration specifications,rather than developing those class definitions by themselves. In someimplementations, a marketplace for sharing/sale and selection ofexisting configuration specifications and reusable class definitions canbe provided, for example, by the cloud-service provider or a third-partyprovider.

In this example, the cloud-service provider 104 provides such a platformfor the sharing of reusable configuration specification and classdefinitions. In some implementations, the frontend 102 of thecloud-service provider provides a definition submission user interfaceand a definition selection interface to facilitate the sharing ofreusable configuration specifications and class definitions. The partiesthat provide the configuration specifications and class definitions forreuse by others serve as definition suppliers 414 for the cloud-serviceprovider 104. The potential definition users include administrativeusers of cloud-based services. The potential definition users also,optionally, include definition suppliers who will create new reusableclass definitions or class definitions for submission based on theexisting class definitions provided by other definition suppliers.

As shown in FIG. 4, the cloud-service manager 222 of the cloud-serviceprovider 104, or a component of the cloud-service manager 222, can serveto manage the platform for sharing reusable class definitions. Thedefinition suppliers 414 submit reusable class definitions to thecloud-service manager 222 through the definition submission userinterface provided by the frontend 120. Each class definition submissioncan include multiple reusable class definitions, such as in a classmodule. Each class definition in the submission is accompanied bydescriptions of the initial configuration state that the classdefinition can accomplish if subsequently used in a configurationspecification. In some implementations, the description also includesinstructions on how the class parameters in the class definition can besubsequently modified in configuration specifications to suit the needsof particular deployments.

When a definition supplier submits a reusable class definition or amodule of reusable class definitions, the cloud-service manager 222 canstore the received class definitions in a class definition database(e.g., the definition database 406). In some implementations, thefrontend 120 provides registration and authentication services for thedefinition suppliers 414. Each class definition or class module receivedfrom a registered definition supplier 414 is stored in association withthe identifier of the definition supplier, such that the definitionsupplier 414 can be properly credited when the class definition issubsequently used or purchased by a definition user.

In some implementations, the definition suppliers 414 can providereusable class definitions for free or for a cost. The cloud-servicemanager 222 can facilitate the sale or license of the reusable classdefinitions to the potential definition users (e.g., administrativeusers of the cloud-service customers 102) through the definition sharingplatform. In some implementations, the definition supplier 414 providesand the cloud-service manager stores respective prices associated withthe sale or licenses for different usage levels for the reusable classdefinitions provided by the definition suppliers 414.

In some implementations, the cloud-service manager 222 provides adefinition selection user interface over the frontend 120. Thedefinition selection user interface presents the class definitions thatare available for reuse, such as in defining new class definitions. Thenew class definitions include those included in the configurationspecification of a new deployment and, optionally, those that aresubmitted to the cloud-service provider for reuse by others. Thepotential definition users (e.g., administrative users of thecloud-service customers and definition suppliers) can view the classdefinitions that are available for selection through the definitionselection interface, along with their prices and descriptions, andoptionally, reviews and quality scores, and decides on whether to reuseone or more of the class definitions in a configuration specification orfor deriving a new class definition.

In some implementations, definition selection user interface allows theuser of the class definitions to download or copy a reusable classdefinition available for selection. In some implementations, the userdoes not have to copy or download the class definition, and can use theclass definitions by simply identifying the module and class name in aconfiguration specification submitted to the cloud-service provider fordeployment. The cloud-service manager 222 will identify and locate theclass definitions that are referenced in the specification file, andkeep track of the usage of the class definition.

In some implementations, the reuse involves an entire module (e.g., the“lamp” module shown in FIG. 3B), where the module includes a collectionof multiple interrelated class definitions for configuring a cloudcomponent that includes multiple sub-components.

In some implementations, the class definitions or class modules arecategorized based on the type of components they model. In someimplementations, the definition selection interface allows the potentialusers of the class definitions to search or review available classdefinitions by categories, functions, definition suppliers, and otherattributes associated with the class definitions and modules.

In some implementations, the cloud-service provider 104 or a third partyprovider also provides a platform for software suppliers 418 to providesoftware solutions accompanied by multiple alternative configurationspecifications or alternative collections of class definitions forconfiguring the software solutions. For example, a personnel managementprogram can be accompanied by configuration specifications that aretailored for cloud-service customers 102 that have different scale,needs, and internal infrastructures. When a cloud-service customer 102purchases or licenses the software solution for deployment in the cloudenvironment of the cloud-service provider 104, the cloud-servicecustomer 102 can choose the configuration specification that best suitsits needs.

In some implementations, the service manager 222 can receive submissionsof software solutions with accompanying configuration specifications(e.g., either as configuration specifications or modules of reusableclass definitions) through a software submission user interface providedthrough the frontend 120. In some implementations, the softwaresubmission user interface includes registration and authenticationcapabilities, such that each submission of a configuration-wrappedsoftware solution 420 is stored in association with the softwareprovider that submitted the configuration-wrapped software solution 420.

The cloud-service provider 104 can provide the configuration-wrappedsoftware solutions in a software selection interface to thecloud-service customers 102 through the frontend 120. The softwareselection interface can also provide the descriptions of the differentconfiguration specifications accompanying each software solution. When auser (e.g., an administrative user of an cloud-based applicationservice) select a software solution and one of the accompanyingconfiguration specifications from the software selection interface, thecloud service provider 104 can launch the software solution in thecloud-based environment according to the selected configurationspecification, with or without additional customizations.

In some implementations, the cloud-service provider 104 facilitates theaccounting (e.g., by an accounting component 426) for the sale andpurchase of the reusable configuration specifications, reusable classdefinitions, and configuration-wrapped software solutions that areaccomplished through the platforms provided by the cloud-serviceprovider 104. In some implementations, the cloud-service provider doesnot need to directly provide these platforms, but provide accountingservices (e.g., by the accounting component 426) to the user andprovider of the reusable configuration specifications, reusable classdefinitions, and configuration-wrapped software solutions based onactual usage that has occurred in the cloud environment of thecloud-service provider 104.

In some implementations, the cloud-service manager 222 includes aservice monitor 422. The service monitor 422 monitors the statuses ofthe cloud-services that have been deployed in the cloud environment ofthe cloud-service provider 104. The statuses monitored by the servicemonitor 422 include, for example, the virtual resources that areemployed for each component of a cloud-based deployment, the usage levelof the virtual resources, the cloud-services that are employed by eachcomponent of the cloud-based deployment, the usage level of thecloud-services. The service monitor 422 can compute performance metricsassociated with each cloud-based deployment based on the statuses of thevirtual resources and the cloud-based services that are associated withthe deployment. The performance metrics include, for example, the numberof user requests received, the latency associated with the responses,the availability of the virtual resources and services, the failure rateof each virtual resource or service, the fault tolerance level of thevirtual resources and services, and so on. In some implementations, theperformance metrics is stored in a performance data store 424 of thecloud-service manager 222.

As disclosed in this specification, cloud-based deployments can becarried out according to configuration specifications written in anobject-oriented specification language, where the configurationspecifications include class definitions that model different aspects ofthe cloud-based deployments at different levels of abstraction. When thecloud-service manager 222 processes a configuration specification into aset of class definitions, the cloud-service manager 222 is able to trackthe hierarchy of class definitions that have influenced theconfiguration of each of those different aspects of the deployment.Further, the cloud-service provider is able to associate the virtualresources and services that are dedicated to the different aspects ofthe cloud-based deployment to the different class hierarchies that haveinfluenced the configuration of those aspects of the cloud-baseddeployment.

Therefore, the object-oriented specification language allows performancemetrics to be derived for each of these different aspects based on thestatus and performance of the virtual resources and services thatcontribute to the performance of the aspect of the cloud-baseddeployment. In particular, the performance associated with each aspectof the cloud-based deployment is associated with the class definitionsthat are involved in configuring that aspect of the cloud-baseddeployment. Then, the performance associated with a class definition canbe used as a factor in determining a quality measure for the classdefinition. If a class definition is used in configuring multiplecloud-based deployments, the aggregated performance associated with theclass definition can be used to assess the quality of the classdefinition.

Using the reusable class definitions and configuration specificationshown in FIGS. 3B and 3C as an example, when the service-cloud manager222 deploys the Mantis and MySQL software applications and the firewallservice in the Mantis application deployment according the“MantisDeployment” class definition 354 and all the base classes onwhich the “MantisDeployment” class definition 354 depends, the servicemanager 222 can monitor the respective performances of the softwareroles, the firewall service, and the underlying virtual machinessupporting the software roles. The cloud-service manager 222 canassociate the respective performances of the frontend role with theclasses that influenced the configuration of the frontend component ofthe Mantis deployment, associate the respective performance of thefirewall component with the classes that influenced the configuration ofthe firewall component, associate the respective performance of thevirtual machines underlying the frontend role with the classes thatinfluenced the configuration of the frontend virtual machines, and soon, for example.

In some implementations, the cloud-service manager 222 can generate asystem block diagram of the cloud-based deployment according to theconfiguration specification writing in the object-oriented specificationlanguage. For example, the nature of the infrastructural components,storage, services, software roles, as well as their interrelationships(e.g., dependencies and connectivity) and reconfiguration triggers, canbe identified from the class definitions in the configurationspecification and represented as corresponding elements in the systemblock diagram of the deployment. The basic system block diagram can becreated when the configuration specification is parsed by the APItranslator 404, for example.

FIG. 5 shows the block diagram 500 that can be created based on thedeployment specification 340 shown in FIG. 3C. When parsing theconfiguration specification 340 of the Mantis application deployment,the cloud-service manager 222 recognizes from the “MantisDeployment”class definition 354 that there are two software roles and a firewallinvolved in the deployment, e.g., the software roles modeled by the“MantisFrontendRole” and the “MantisDatabaseRole” class definitions anda firewall modeled by the “MatisFirewall” class definition. Therefore,the cloud-service manager 222 can add a block 504 for the frontend role,a block 506 for the database role, as well as a block 508 for thefirewall service within a block 502 representing the Mantis applicationdeployment.

Next, according to the class definition of the “MantisFrontendRole”class, the cloud-service manager 222 determines that the softwareapplication serving the frontend role is to be deployed according to theclass definition of the “mantis frontend” class. The cloud-servicemanager 222 therefore adds a block 510 within the block 504, torepresent the frontend software that is serving the frontend role.Similarly, from the class definition of the “MantisDatabaseRole” class,the service manager 222 determines that the software application servingthe database role is to be deployed according to the class definition ofthe “mantis backend” class. Therefore, the service manager adds a block512 within the block 506, to represent the backend database softwarethat is serving the database role.

Furthermore, according to the class definitions 348 and 350 of the“MantisFrontendRole” and the “MantisDatabaseRole,” the frontend role andthe database role are connected to each other. Based on the classdefinition 352 of the “MantisFirewall,” the firewall is connected to thefrontend role. Therefore, the cloud-service manager 222 can insert aconnection 514 between the block 504 and the block 506, to represent theconnectivity relationship between the frontend role and the databaserole. In addition, the cloud-service manager 222 also inserts aconnection 516 between the block 504 and the block 508, to represent theconnectivity relationship between the frontend role and the firewall.

In addition, since the “MantisFrontRole” class definition 348 extendsfrom the “FrontendRole” class definition 330, the cloud-service manager222 determines from the class definition 330 of the “FrontendRole” classthat, the frontend software (e.g., the Mantis software) is to beinstalled on a virtual machine modeled by the “FrontendVM” classdefinition 324. Similarly, the “MantisDatabaseRole” class definition 350extends from the “DatabaseRole” class definition 332, and thecloud-service manager 222 determines from the class definition 332 ofthe “DataBaseRole” class that, the backend database software (e.g., theMySQL database software) is to be installed on the same virtual machineas the frontend role software. Based on the above information, theservice manager 222 adds a block 518 under the blocks 504 and 506, torepresent the underlying virtual machine for the frontend role and thedatabase role.

Furthermore, according to the “DatabaseRole” class definition 332, thecloud-service manager 222 determines that a persistent disk is connectedto the database role by a mount point on the underlying virtual machine.The persistent disk is deployed according to the specification specifiedin the “MysqlPD” class definition 328. Therefore, the service manager222 adds a block 520 to the block 502 representing the mantisdeployment, and adds a connection 522 to represent the connectivityrelationship between the database software, its underlying virtualmachine, and the permanent disk.

In some implementations, when the components of the deployment isdeployed, the service manager 222 can also record identifiers associatedwith the underlying infrastructure components (e.g., process IDs oridentifiers of the virtual machines and other virtual resources) foreach block or connection represented in the block diagram 500. When thecloud-service manager 222 monitors the statuses of the underlyingvirtual resources and services for the deployment, the cloud-servicemanager 222 optionally determines the performance or usage metrics foreach component (e.g., blocks and connections) represented in the blockdiagram 500. The cloud-service manager 222 can also optionally representthe performances and usage of the different component in the systemblock diagram 500.

In some implementations, visualization of the performances and usage ofthese different components of the deployment and their changes over timecan be shown on the block diagram 500. In some implementations, thecloud-service manager 222 can present the performance and usagestatistics in a visual form on the block diagram in a managementinterface of the cloud services for each cloud-service user. Forexample, the performance and usage statistics can be represented as ahistogram or pie chart that dynamically changes according to the actualconditions of the components in the cloud environment. In someimplementations, the cloud-service provider bills the cloud-servicecustomers according to the performance and usage statistics.

In some implementations, the configuration specification optionallyincludes programmatically triggered reconfiguration requests. Forexample, the configuration specification for a component can specifiedthat when a particular monitored parameter reaches a specified thresholdvalue, the cloud-service manager 222 is to scale the provisioned virtualmachine or services by a specified amount. For a more specific example,the class definition of the persistent disk class (e.g., the “MysqlPD”class definition) can include a statement that requests an increase inthe size of the persistent disk when the disk capacity is 80% utilized;the class definition of the “frontendVM” class can request that when thelatency of the frontend role is more than one second, the“replica-count” parameter of the FrontendVM is to be increased by one;and so on.

As set forth in this specification, the object-oriented specificationlanguage allows the configuration of each component in a cloud-baseddeployment to be specified by a respective set of class definitions.When parsing a configuration specification, the service manager is ableto identify the components of the deployment, and identify all of thebase classes whose class parameters contributed to or influenced theconfiguration state of the component. In some implementations, theperformance of each component is associated with the class definitionsthat contributed to the configuration of that component. If a classdefinition contributed to the configuration of multiple components inmultiple deployments, the performance of these multiple components inthe multiple deployments can all be associated with that classdefinition. The quality of the class definition can be assessed based atleast in part on the aggregated performance of all of the multiplecomponents in the multiple deployments.

In some implementations, the cloud-service manager keeps track of theusage of each class definition in the cloud-based environment andcharges the cloud-service users that have used the class definition intheir deployments. Optionally, the amount of charge billed to the usersis based on the amount of usage the user has accrued for the classdefinition in all of the deployments the user has requested. In someimplementations, where the class definitions are provided by third-partydefinition providers, the cloud-service manager 222 can record a creditto the third-party definition provider for each use of the classdefinition provided by the third-party definition provider.

For example, when parsing the configuration specification for the Mantisapplication deployment shown in FIG. 3C, the cloud-service manager 222records that the Mantis frontend component 504 is deployed according tothe “MantisFrontendRole” class definition 348, which extends the“lamp.FrontendRole” class definition 330, uses the “mantis_frontend”class definition for software configuration, and the “MantisPackage”class definition 346 to identify the location of the software package,and is connected to the “MantisDatabaseRole” class 350. Further, theservice manager 222 determines that the “lamp.FrontendRole” classdefinition 330 further extends from the “std.Role” class definition,uses the “FrontendVM” class definition 324, and that the “FrontendVM”class definition 324 extends from the “utils.ConfiguratorLAMP” classdefinition.

The cloud-service manager 222 can continue to identify the classdefinitions that are involved in the configuration of the frontend rolecomponent of the deployment by tracing the class hierarchies connectedto the “MantisFrontendRole” class definition 348, until the mostfundamental sets of class definitions are identified. All of the classdefinitions that contributed to the configuration of the frontend rolecomponent are associated with the frontend role component for thedeployment. A similar process can be carried out for each component ofthe deployment.

When the deployment is carried out, the cloud-service manager 222 canrecord the usage of each class definition in configuring the deploymentaccording to the number of times that the class definition is used inthe deployment. In some implementations, multiple uses of a classdefinition is counted only once in each deployment or for each user,depending on the payment structure (e.g., fees per use license or persale) established by the definition supplier of the class definition.

In some implementations, in a marketplace of reusable class definitions,each reused class definition can be ranked against other reused classdefinitions according to the aggregate performance of the classdefinition in all the deployments that used the class definition. Insome implementations, the performance of a deployment can be associatedwith each class definition that contributed to the configuration of thedeployment, and used in evaluating the quality of the class definition.In some implementations, only performances of those components whoseconfigurations are influenced by a class definition are associated withthe class definition and used in evaluating the quality of the classdefinition.

For example, when the cloud-service manager identified multiplecomponents in multiple deployments that are influenced by a virtualmachine class definition, the aggregated performance of the multiplecomponents are used in evaluating the quality of the virtual machineclass definition. In addition, when the cloud-service manager identifiesall of the class definitions that contributed to the configuration of afrontend role component of a deployment, the performance associated withthe frontend role component in the deployment will be associated witheach of these identified class definitions.

In some implementations, a quality score is calculated for each classdefinition based on the aggregated performance associated with all ormultiple components or deployments that are configured based at least inpart on the class definition. The quality score can be presented withthe class definition in the definition selection interface provided bythe cloud-service provider. In some implementations, multiple qualitymetrics can be calculated for each class definition based on, forexample, the scales of the deployments that utilized the classdefinition, the weight or influence of the class definition in eachdeployment that utilized the class definition, the availability, faulttolerance, scalability, and failure rate of the components configuredaccording to the class definition, the types of problems encountered,the modifications required to solve the encountered problems, explicituser feedback, and so on. Based on the various quality metrics, one ormore types of quality scores can be provided for each shared classdefinition and a potential definition user can browse the list ofavailable shared class definitions based on the quality scores.

Although the above example describes the quality scores with respect toreusable class definitions, similar quality scores can be calculated forreusable class modules, reusable configuration specifications, orconfiguration-wrapped software solutions.

FIG. 6 is a flow diagram of an example process 600 for processing aconfiguration specification written in an object-oriented specificationlanguage. An example of such a high-level object-oriented specificationlanguage is described in the examples shown in FIGS. 3A-3C. The exampleprocess 600 can be performed by a cloud-service provider (e.g., thecloud-service provider 104 shown in FIG. 1), such as by a cloud-servicemanager (e.g., the cloud-service manager 222) of the cloud-serviceprovider. In some implementations, the cloud-service manager performsthe process 600 by an API translator component (e.g., the API translator404 in FIG. 4).

In the example process 600, a configuration specification forconfiguring a cloud-based deployment is received (e.g., by the APItranslator of a cloud-service provider) (602). The configurationspecification is written in an object-oriented specification languageand requires instantiation of class definitions of one or more classes.Each class models a respective data or functional component of thecloud-based deployment using a group of configurable class parameters.The respective class definition of each class represents a requestedstate of the data or functional component modeled by the class. Aplurality of API calls for configuring the cloud-based deployment arederived based on the class definitions of the one or more classes (604).Then, the API translator of the cloud-service provider causes theplurality of API calls to be executed to configure the cloud-baseddeployment (606).

In some implementations, the one or more classes include at least anexisting base class and at least a customized class extended from theexisting base class. In some implementations, the customized classinherits respective class parameters of the existing base class andmodifies a value of at least one of the class parameters inherited fromthe existing base class. In addition, or alternatively, the customizedclass inherits respective class parameters of the existing base classand includes at least one new class parameter not present in theexisting base class.

In some implementations, the data or functional component modeled byeach class is one of a virtual device supporting a cloud-basedenvironment, a service utilized in the cloud-based environment, asoftware role performed by an installed application in the cloud-basedenvironment, a data package holding data to be used during deployment oroperation of the cloud-based environment, or a combination of one ormore thereof.

In some implementations, the object-oriented specification languagesupports dependency between class definitions, and a definitiondependency between a first class and a second class represents adeployment dependency between respective components modeled by the firstand the second class. In some implementations, the definition dependencybetween the first class and the second class is expressed by a classparameter of the first class where the class parameter of the firstclass refers to an instance of the second class.

In some implementations, the object-oriented specification languagesupports connectivity between class definitions, and a value assignmentlinking an instance of a second class to a class parameter of a firstclass represents a connectivity between respective components modeled bythe first class and the second class.

FIG. 7 is a flow diagram of an example process 700 for deriving a blockdiagram showing a topology of a cloud-based deployment based on theconfiguration specification of the cloud-based deployment. The exampleprocess 700 can be performed by a cloud-service manager of acloud-service provider (e.g., the cloud-service provider 104 shown inFIGS. 1 and 4).

In the example process 700, the cloud-service provider identifies, basedon the respective class definitions of the one or more classes in aconfiguration specification, a plurality of data and functionalcomponents modeled by the one or more classes and one or more dependencyand connectivity relationships existing among the plurality of data orfunctional components (702). Then, the cloud-service provider derives ablock diagram of a cloud-based environment based on the identifiedplurality of data and functional components and the identifieddependency and connectivity relationships (704). In someimplementations, when deriving the block diagram, the cloud-serviceprovider also represents trigger events for dynamic reconfiguration ofthe cloud-based environment in the block diagram.

FIG. 8 is a flow diagram of an example process 800 for monitoringperformance of cloud-based deployments and associating the performancewith class definitions that are used in configuring the cloud-baseddeployments.

In the example process 800, for each class definition, the cloud-serviceprovider identifies an aspect of the cloud-based deployments that areinfluenced by the class definition in terms the respective initialconfiguration state of the aspect (802). The cloud-service providermonitors one or more performance metrics associated with the identifiedaspect (804). The cloud-service provider associates the one or moreperformance metrics with the class definition (806). Then, thecloud-service provider utilizes the one or more performance metrics incalculating a quality metric of the class definition (808).

FIG. 9 is a flow diagram of an example process 900 for evaluating thequality of a reused class definition based on aggregated performance ofmultiple cloud-based deployments that were configured at least in partbased on the reused class definition.

In the example process 900, the cloud-service provider identifies aplurality of cloud-based deployments each having been carried outaccording to a respective configuration specification written in theobject-oriented specification language (902). The cloud-service providerthen identifies at least one base class whose class definition is usedin multiple of the plurality of cloud-based deployments (904). Thecloud-service provider monitors respective performance of each of themultiple of the plurality of cloud-based deployments (906). Thecloud-service provider then calculates a quality metric of the at leastone base class based on aggregated performance of the multiple of theplurality of cloud-based deployments (908). In some implementations, therespective performance of each of the multiple of the plurality ofcloud-based environment is a performance associated with a data orfunction component modeled by the at least one class.

FIG. 10 is a flow diagram of an example process 1000 for deriving APIcalls for configuring a cloud-based deployment based on classdefinitions used in a configuration specification.

In the example process 1000, the cloud-service provider storesrespective class definitions of a plurality of core classes of theobject-oriented specification language (1010). Each core classcorresponds to a modular component of a cloud-based environment and eachcore class is extendable with additional class parameters to configurethe respective modular component. The cloud-service provider also storesa mapping between each of the core classes and a respective group of APIcalls (1020). The respective group of API calls is for configuring themodular component associated with the core class according to the classparameters of the core class. The cloud-service provider also stores aplurality of protocols for modifying the respective groups of API callsassociated with each core class to obtain a new group of API calls for anew class definition derived from the core class (1030).

In some implementations, to derive the plurality of API calls forconfiguring the cloud-based deployment, the cloud-service providerderives the plurality of API calls based on the respective groups of APIcalls associated with one or more of the plurality of core classes fromwhich the one or more classes of the configuration specification arederived, and based on the plurality of protocols for modifying therespective groups of API calls.

In some implementations, the plurality of protocols further includesrules for imposing an ordering of the groups of API calls according todependency and connectivity relationships specified in class definitionswritten according to the object-oriented specification language.

FIG. 11 is a flow diagram of an example process 1100 for providing aplatform for sharing reusable class definitions. The example process1100 can be performed by a cloud-service provider or a platform providerthat does not provider cloud-based services.

In the example process 1100, the cloud-service provider or platformprovider receives a respective definition submission from each of aplurality of definition suppliers (1110). The respective definitionsubmission includes one or more class definitions written in anobject-oriented specification language. Each class definition models adata or functional component of a cloud-based deployment using a groupof configurable class parameters and is extendable to create at leastone new class definition by a modification to one or more of the groupof configurable class parameters or an addition of one or more new classparameters. The cloud-service provider or platform provider thenprovides a user interface that presents the class definitions receivedfrom the plurality of definition suppliers, for review and selection bya plurality of definition users (1120).

FIG. 12 is a flow diagram of an example process 1200 for configuringmultiple distinct cloud-based deployments based on distinctconfiguration specifications that all use at least one common reusableclass definition. The example process 1200 can be performed by acloud-service provider, such as the example cloud-service provider 104shown in FIG. 4.

In the example process 1200, the cloud-service provider receives aplurality of distinct configuration specifications written in theobject-oriented specification language (1210). The plurality of distinctconfiguration specifications are each for configuring a distinctcloud-based deployment and including a distinct class definition thatextends from the same one of the class definitions received from theplurality of definition suppliers. Then, the cloud-service providerconfigures each of the distinct cloud-based deployments based at leaston the same one of the received class definitions and the distinct classdefinition that extends therefrom in the distinct configurationspecification of the distinct cloud-based deployment (1220).

FIG. 13 is a flow diagram of an example process 1300 for chargingdefinition users and crediting definition suppliers based on usage ofthe reusable class definitions provided by the definition suppliers.

In the example process 1300, for each of the received class definitions,the cloud-service provider monitors usage of the class definition in aplurality of configuration specifications that have been used toconfigure a plurality of cloud-based deployments (1310). Thecloud-service provider records, for each use of the class definition inthe plurality of configuration specifications, a credit to a definitionsupplier of the class definition and a charge to a definition userassociated with the use (1320).

In some implementations, the usage of the class definition includes aninstantiation of the class definition in a respective configurationspecification that has been used to carry out a respective cloud-baseddeployment. In some implementations, the usage of the class definitionincludes an extension of the class definition to create a new classdefinition that is instantiated in a respective configurationspecification used to carry out a respective cloud-based deployment.

FIG. 14 is a flow diagram of an example process 1400 for providing aplatform for selling “configuration-wrapped” software solutions. Theprocess 1400 can be provided by a cloud-service provider or a platformprovider that does not provide cloud-based services.

In the example process 1400, the cloud-service provider or platformprovider receives a software submission from a software supplier (1410).The software submission includes a software application to be deployedin a cloud-based environment and a plurality of distinct configurationspecifications each for deploying the software application in thecloud-based environment in a distinct manner. Then, the cloud-serviceprovider or platform provider provides the plurality of distinctconfiguration specifications for review and selection by a software user(1420).

FIG. 15 is a flow diagram of an example process 1500 for chargingsoftware users and crediting software providers based on the selectionof configuration-wrapped software solutions by software users. Theexample process 1500 can be performed by a cloud-service provider (e.g.,the cloud-service provider 104 shown in FIG. 4).

In the example process 1500, the cloud-service provider receivesselection of one of the plurality of distinct configurationspecification by the software user (1510). The cloud-service providerdeploys the software application in the cloud-based environmentaccording to the selected distinct configuration specification (1520).Then, the cloud-service provider records a charge to the software userand a credit to the software supplier based on a respective priceassociated the selected distinct configuration specification (1530). Insome implementations, to provide the plurality of class definitions forselection, the cloud-service provider provides the respectiveperformance metrics with each of the plurality of class definitions foruser review in a selection user interface.

FIG. 16 is a flow diagram of an example process 1600 for utilizingaggregated performance metrics of multiple cloud-based deployments inranking reusable class definitions that have been used in configuringthe multiple cloud-based deployments. The example process 1600 can beperformed by a cloud-service provider (e.g., a cloud-service provider104 shown in FIG. 4).

In the example process 1600, the cloud-service provider provides aplurality of class definitions for selection (1610). Each classdefinition models a respective data or functional component of acloud-based environment using a group of configurable class parameters.Each class definition supports instantiation and inheritance of theclass definition in a configuration specification for a cloud-baseddeployment. The cloud-service provider also derives respectiveperformance metrics associated with each of the plurality of classdefinitions based on aggregated performance of multiple cloud-baseddeployments, where the multiple cloud-based deployments had been carriedout according to respective configuration specifications that requireinstantiation of the class definition or a new class definition derivedfrom the class definition (1620). Then, the cloud-service providerutilizes the respective performance metrics associated with each of theplurality of class definitions in ranking the plurality of classdefinitions (1630).

FIG. 17 is a flow diagram of an example process 1700 for categorizingreusable class definitions and ranking the reusable class definitionswithin their respective categories.

In the example process 1700, the cloud-service provider categorizing theplurality of class definitions based on the respective data orfunctional components of the cloud-based environment modeled by theplurality of class definitions (1710). Then, the cloud-service providerranks the plurality of class definitions within the class definitions'respective categories (1720).

FIG. 18 is a flow diagram of an example process 1800 for associatingperformances of multiple cloud-based deployments with a class definitionthat was used to configure the multiple cloud-based deployments.

In the example process 1800, for each of a plurality of classdefinitions, the cloud-service provider identifies a plurality ofcloud-based deployments that had been carried out according torespective configuration specifications that required instantiation ofthe class definition or at least one new class definition derived fromthe class definition (1810). The cloud-service provider monitorsrespective performances of the plurality of cloud-based deployments(1820). The cloud-service provider then associates the respectiveperformances of the plurality of deployments with the class definition(1830).

FIG. 19 is a flow diagram of an example process 1900 for derivingperformance metrics associated with a reused class definition based onaggregated performance of multiple deployments.

When deriving respective performance metrics associated with each of aplurality of class definitions based on aggregated performance ofmultiple cloud-based deployments, the cloud-service provider performsthe example process 1900. In the example process 1900, the cloud-serviceprovider, for each of the plurality of class definitions, identifies oneor more data or functional components in the plurality of cloud-baseddeployments that were configured according to the class definition or anew class definition derived from the class definition (1910). Thecloud-service provider identifies one or more performance metricsassociated with the identified one or more data or functional components(1920). Then, the cloud-service provider derives the respectiveperformance metrics associated with the class definition by aggregatingthe identified one or more performance metrics (1930). In someimplementations, the performance metrics include one or more measures oflatency, reliability, scalability, availability, or security.

FIG. 20 is a flow diagram of an example process 2000 for utilizingmultiple factors in ranking reusable class definitions.

In the example process 2000, for each class definition, thecloud-service provider tracks a respective count of cloud-baseddeployments that have been configured at least in part according to theclass definition (2010). Optionally, the cloud-service provider tracks arespective count of problems encountered in cloud-based deployments thathave been configured at least in part according to the class definition.Optionally, the cloud-service provider also tracks a number of requiredchanges to resolve the problems encountered in the cloud-baseddeployments that have been configured at least in part according to theclass definition. Then, the cloud-service provider utilizes therespective counts associated with the plurality of class definitions inthe ranking of the plurality of class definitions (2020). Optionally,the cloud-service provider also utilizes the respective counts of theproblems and the respective numbers of required changes associated withthe plurality of class definitions in the ranking of the plurality ofclass definitions.

In some implementations, the respective numbers of required changesassociated with the plurality of class definitions are used to calculaterespective weights given to the respective performance metricsassociated with the plurality of class definitions in ranking theplurality of class definitions.

Embodiments of the subject matter and the functional operationsdescribed in this specification can be implemented in digital electroniccircuitry, or in computer software, firmware, or hardware, including thestructures disclosed in this specification and their structuralequivalents, or in combinations of one or more of them. Embodiments ofthe subject matter described in this specification can be implemented asone or more computer programs, i.e., one or more modules of computerprogram instructions encoded on a computer storage medium for executionby, or to control the operation of, data processing apparatus.Alternatively or in addition, the program instructions can be encoded ona propagated signal that is an artificially generated signal, e.g., amachine-generated electrical, optical, or electromagnetic signal, thatis generated to encode information for transmission to suitable receiverapparatus for execution by a data processing apparatus. The computerstorage medium can be a machine-readable storage device, amachine-readable storage substrate, a random or serial access memorydevice, or a combination of one or more of them.

The term “data processing apparatus” encompasses all kinds of apparatus,devices, and machines for processing data, including by way of example aprogrammable processor, a computer, or multiple processors or computers.The apparatus can include special purpose logic circuitry, e.g., an FPGA(field programmable gate array) or an ASIC (application specificintegrated circuit). The apparatus can also include, in addition tohardware, code that creates an execution environment for the computerprogram in question, e.g., code that constitutes processor firmware, aprotocol stack, a database management system, an operating system, or acombination of one or more of them.

A computer program (also known as a program, software, softwareapplication, script, or code) can be written in any form of programminglanguage, including compiled or interpreted languages, or declarative orprocedural languages, and it can be deployed in any form, including as astand alone program or as a module, component, subroutine, or other unitsuitable for use in a computing environment. A computer program may, butneed not, correspond to a file in a file system. A program can be storedin a portion of a file that holds other programs or data (e.g., one ormore scripts stored in a markup language document), in a single filededicated to the program in question, or in multiple coordinated files(e.g., files that store one or more modules, sub programs, or portionsof code). A computer program can be deployed to be executed on onecomputer or on multiple computers that are located at one site ordistributed across multiple sites and interconnected by a communicationnetwork.

The processes and logic flows described in this specification can beperformed by one or more programmable processors executing one or morecomputer programs to perform functions by operating on input data andgenerating output. The processes and logic flows can also be performedby, and apparatus can also be implemented as, special purpose logiccircuitry, e.g., an FPGA (field programmable gate array) or an ASIC(application specific integrated circuit).

Processors suitable for the execution of a computer program include, byway of example, both general and special purpose microprocessors, andany one or more processors of any kind of digital computer. Generally, aprocessor will receive instructions and data from a read only memory ora random access memory or both. The essential elements of a computer area processor for performing or executing instructions and one or morememory devices for storing instructions and data. Generally, a computerwill also include, or be operatively coupled to receive data from ortransfer data to, or both, one or more mass storage devices for storingdata, e.g., magnetic, magneto optical disks, or optical disks. However,a computer need not have such devices. Moreover, a computer can beembedded in another device, e.g., a mobile telephone, a personal digitalassistant (PDA), a mobile audio or video player, a game console, aGlobal Positioning System (GPS) receiver, or a portable storage device(e.g., a universal serial bus (USB) flash drive), to name just a few.

Computer readable media suitable for storing computer programinstructions and data include all forms of nonvolatile memory, media andmemory devices, including by way of example semiconductor memorydevices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks,e.g., internal hard disks or removable disks; magneto optical disks; andCD ROM and DVD-ROM disks. The processor and the memory can besupplemented by, or incorporated in, special purpose logic circuitry.

To provide for interaction with a user, embodiments of the subjectmatter described in this specification can be implemented on a computerhaving a display device, e.g., a CRT (cathode ray tube) or LCD (liquidcrystal display) monitor, for displaying information to the user and akeyboard and a pointing device, e.g., a mouse or a trackball, by whichthe user can provide input to the computer. Other kinds of devices canbe used to provide for interaction with a user as well; for example,feedback provided to the user can be any form of sensory feedback, e.g.,visual feedback, auditory feedback, or tactile feedback; and input fromthe user can be received in any form, including acoustic, speech, ortactile input. In addition, a computer can interact with a user bysending documents to and receiving documents from a device that is usedby the user; for example, by sending web pages to a web browser on auser's user device in response to requests received from the webbrowser.

Embodiments of the subject matter described in this specification can beimplemented in a computing system that includes a back end component,e.g., as a data server, or that includes a middleware component, e.g.,an application server, or that includes a front end component, e.g., aclient computer having a graphical user interface or a Web browserthrough which a user can interact with an implementation of the subjectmatter described in this specification, or any combination of one ormore such back end, middleware, or front end components. The componentsof the system can be interconnected by any form or medium of digitaldata communication, e.g., a communication network. Examples ofcommunication networks include a local area network (“LAN”) and a widearea network (“WAN”), e.g., the Internet.

The computing system can include clients and servers. A client andserver are generally remote from each other and typically interactthrough a communication network. The relationship of client and serverarises by virtue of computer programs running on the respectivecomputers and having a client-server relationship to each other.

While this specification contains many specific implementation details,these should not be construed as limitations on the scope of anyinvention or of what may be claimed, but rather as descriptions offeatures that may be specific to particular embodiments of particularinventions. Certain features that are described in this specification inthe context of separate embodiments can also be implemented incombination in a single embodiment. Conversely, various features thatare described in the context of a single embodiment can also beimplemented in multiple embodiments separately or in any suitablesubcombination. Moreover, although features may be described above asacting in certain combinations and even initially claimed as such, oneor more features from a claimed combination can in some cases be excisedfrom the combination, and the claimed combination may be directed to asubcombination or variation of a subcombination.

Similarly, while operations are depicted in the drawings in a particularorder, this should not be understood as requiring that such operationsbe performed in the particular order shown or in sequential order, orthat all illustrated operations be performed, to achieve desirableresults. In certain circumstances, multitasking and parallel processingmay be advantageous. Moreover, the separation of various systemcomponents in the embodiments described above should not be understoodas requiring such separation in all embodiments, and it should beunderstood that the described program components and systems cangenerally be integrated together in a single software product orpackaged into multiple software products.

Particular embodiments of the subject matter have been described. Otherembodiments are within the scope of the following claims. For example,the actions recited in the claims can be performed in a different orderand still achieve desirable results. As one example, the processesdepicted in the accompanying figures do not necessarily require theparticular order shown, or sequential order, to achieve desirableresults. In certain implementations, multitasking and parallelprocessing may be advantageous.

1. A computer-implemented method, comprising: receiving a configurationspecification for configuring a cloud-based deployment, theconfiguration specification being written in specification language andrequiring instantiation of respective class definitions of one or moreclasses, each class modeling a respective data or functional componentof the cloud-based deployment using a group of configurable classparameters, and the respective class definition of each classrepresenting a requested state of the data or functional componentmodeled by the class; deriving a plurality of application programminginterface (API) calls for configuring the cloud-based deployment basedon the class definitions of the one or more classes; causing theplurality of API calls to be executed to configure the cloud-baseddeployment; identifying, based on the respective class definitions ofthe one or more classes, a plurality of data and functional componentsmodeled by the one or more classes, and one or more dependency andconnectivity relationships existing among the plurality of data orfunctional components; deriving a block diagram of a cloud-basedenvironment based on the identified plurality of data and functionalcomponents and the identified dependency and connectivity relationships;and representing trigger events for dynamic reconfiguration of thecloud-based environment in the block diagram.
 2. Thecomputer-implemented method of claim 1, wherein: the one or more classesinclude at least an existing base class and at least a customized classextended from the existing base class, the customized class inheritsrespective class parameters of the existing base class, and thecustomized class modifies a value of at least one of the classparameters inherited from the existing base class or includes at leastone new class parameter not present in the existing base class.
 3. Thecomputer-implemented method of claim 1, wherein: the data or functionalcomponent modeled by each class is one of a virtual device supporting acloud-based environment, a service utilized in the cloud-basedenvironment, a software role performed by an installed application inthe cloud-based environment, a data package holding data to be usedduring deployment or operation of the cloud-based environment, or acombination of one or more thereof.
 4. The computer-implemented methodof claim 1, wherein: the specification language supports at least one ofdependency between class definitions and connectivity between classdefinitions, where a definition dependency between a first class and asecond class represents a deployment dependency between respectivecomponents modeled by the first and the second class, and where a valueassignment linking an instance of a second class to a class parameter ofa first class represents a connectivity between respective componentsmodeled by the first class and the second class.
 5. Acomputer-implemented method, comprising: receiving a configurationspecification for configuring a cloud-based deployment, theconfiguration specification being written in a specification languageand requiring instantiation of respective class definitions of one ormore classes, each class modeling a respective data or functionalcomponent of the cloud-based deployment using a group of configurableclass parameters, and the respective class definition of each classrepresenting a requested state of the data or functional componentmodeled by the class; deriving a plurality of application programminginterface (API) calls for configuring the cloud-based deployment basedon the class definitions of the one or more classes; causing theplurality of API calls to be executed to configure the cloud-baseddeployment, identifying a plurality of cloud-based deployments eachhaving been carried out according to a respective configurationspecification written in the specification language; identifying atleast one base class whose class definition is used in multiple of theplurality of cloud-based deployments; monitoring respective performanceof each of the multiple of the plurality of cloud-based deployments; andcalculating a quality metric of the at least one base class based onaggregated performance of the multiple of the plurality of cloud-baseddeployments.
 6. The computer-implemented method of claim 5, wherein: theone or more classes include at least an existing base class and at leasta customized class extended from the existing base class, the customizedclass inherits respective class parameters of the existing base class,and the customized class modifies a value of at least one of the classparameters inherited from the existing base class or includes at leastone new class parameter not present in the existing base class.
 7. Thecomputer-implemented method of claim 5, wherein: the data or functionalcomponent modeled by each class is one of a virtual device supporting acloud-based environment, a service utilized in the cloud-basedenvironment, a software role performed by an installed application inthe cloud-based environment, a data package holding data to be usedduring deployment or operation of the cloud-based environment, or acombination of one or more thereof.
 8. The computer-implemented methodof claim 5, wherein: the specification language supports at least one ofdependency between class definitions and connectivity between classdefinitions, and where a definition dependency between a first class anda second class represents a deployment dependency between respectivecomponents modeled by the first and the second class, and where a valueassignment linking an instance of a second class to a class parameter ofa first class represents a connectivity between respective componentsmodeled by the first class and the second class.
 9. Acomputer-implemented, comprising: receiving a configurationspecification for configuring a cloud-based deployment, theconfiguration specification being written in a specification languageand requiring instantiation of respective class definitions of one ormore classes, each class modeling a respective data or functionalcomponent of the cloud-based deployment using a group of configurableclass parameters, and the respective class definition of each classrepresenting a requested state of the data or functional componentmodeled by the class; deriving a plurality of application programminginterface (API) calls for configuring the cloud-based deployment basedon the class definitions of the one or more classes; causing theplurality of API calls to be executed to configure the cloud-baseddeployment; storing respective class definitions of a plurality of coreclasses of the specification language, each core class corresponding toa modular component of a cloud-based environment, each core class beingextendable with additional class parameters to configure the respectivemodular component; storing a mapping between each of the core classesand a respective group of API calls, the respective group of API callsfor configuring the modular component associated with the core classaccording to the class parameters of the core class; and storing aplurality of protocols for modifying the respective groups of API callsassociated with each core class to obtain a new group of API calls for anew class definition derived from the core class.
 10. The method ofclaim 9, wherein deriving the plurality of API calls for configuring thecloud-based deployment further comprises: deriving the plurality of APIcalls based on the respective groups of API calls associated with one ormore of the plurality of core classes from which the one or more classesof the configuration specification are derived, and based on theplurality of protocols for modifying the respective groups of API calls.11. The method of claim 9, wherein: the plurality of protocols furtherincludes rules for imposing an ordering of the groups of API callsaccording to dependency and connectivity relationships specified inclass definitions written according to the specification language. 12.The computer-implemented method of claim 9, wherein: the one or moreclasses include at least an existing base class and at least acustomized class extended from the existing base class, the customizedclass inherits respective class parameters of the existing base class,and the customized class modifies a value of at least one of the classparameters inherited from the existing base class or includes at leastone new class parameter not present in the existing base class.
 13. Thecomputer-implemented method of claim 9, wherein: the data or functionalcomponent modeled by each class is one of a virtual device supporting acloud-based environment, a service utilized in the cloud-basedenvironment, a software role performed by an installed application inthe cloud-based environment, a data package holding data to be usedduring deployment or operation of the cloud-based environment, or acombination of one or more thereof.
 14. The computer-implemented methodof claim 9, wherein: the specification language supports dependencybetween class definitions, and a definition dependency between a firstclass and a second class represents a deployment dependency betweenrespective components modeled by the first and the second class.
 15. Thecomputer-implemented method of claim 9, wherein: the specificationlanguage supports connectivity between class definitions, and a valueassignment linking an instance of a second class to a class parameter ofa first class represents a connectivity between respective componentsmodeled by the first class and the second class.
 16. A non-transitorycomputer-readable medium having instructions stored thereon, theinstructions, when executed by one or more processors, cause theprocessors to perform operations comprising: receiving a configurationspecification for configuring a cloud-based deployment, theconfiguration specification being written in specification language andrequiring instantiation of respective class definitions of one or moreclasses, each class modeling a respective data or functional componentof the cloud-based deployment using a group of, configurable classparameters, and the respective class definition of each classrepresenting a requested state of the data or functional componentmodeled by the class; deriving a plurality of application programminginterface (API) calls for configuring the cloud-based deployment basedon the class definitions of the one or more classes; causing theplurality of API calls to be executed to configure the cloud-baseddeployment; storing respective class definitions of a plurality of coreclasses of the specification language, each core class corresponding toa modular component of a cloud-based environment, each core class beingextendable with additional class parameters to configure the respectivemodular component; storing a mapping between each of the core classesand a respective group of API calls, the respective group of API callsfor configuring the modular component associated with the core classaccording to the class parameters of the core class; and storing aplurality of protocols for modifying the respective groups of API callsassociated with each core class to obtain a new group of API calls for anew class definition derived from the core class.
 17. Thecomputer-readable medium of claim 16, wherein: the one or more classesinclude at least an existing base class and at least a customized classextended from the existing base class, the customized class inheritsrespective class parameters of the existing base class, and thecustomized class modifies a value of at least one of the classparameters inherited from the existing base class or includes at leastone new class parameter not present in the existing base class.
 18. Thecomputer-readable medium of claim 16, wherein: the data or functionalcomponent modeled by each class is one of a virtual device supporting acloud-based environment, a service utilized in the cloud-basedenvironment, a software role performed by an installed application inthe cloud-based environment, a data package holding data to be usedduring deployment or operation of the cloud-based environment, or acombination of one or more thereof.
 19. The computer-readable medium ofclaim 16, wherein: the objet ed-specification language supportsdependency between class definitions, and a definition dependencybetween a first class and a second class represents a deploymentdependency between respective components modeled by the first and thesecond class.
 20. The computer-readable medium of claim 16, wherein: thespecification language supports connectivity between class definitions,and a value assignment linking an instance of a second class to a classparameter of a first class represents a connectivity between respectivecomponents modeled by the first class and the second class.
 21. Thecomputer-readable medium of claim 16, wherein deriving the plurality ofAPI calls for configuring the cloud-based deployment further comprises:deriving the plurality of API calls based on the respective groups ofAPI calls associated with one or more of the plurality of core classesfrom which the one or more classes of the configuration specificationare derived, and based on the plurality of protocols for modifying therespective groups of API calls.
 22. The computer-readable medium ofclaim 16, wherein: the plurality of protocols further includes rules forimposing an ordering of the groups of API calls according to dependencyand connectivity relationships specified in class definitions writtenaccording to the specification language.
 23. A system, comprising: oneor more processors; and memory having instructions stored thereon, theinstructions, when executed by the one or more processors, cause theprocessors to perform operations comprising: receiving a configurationspecification for configuring a cloud-based deployment, theconfiguration specification being written in specification language andrequiring instantiation of respective class definitions of one or moreclasses, each class modeling a respective data or functional componentof the cloud-based deployment using a group of configurable classparameters, and the respective class definition of each classrepresenting a requested state of the data or functional componentmodeled by the class; deriving a plurality of application programminginterface (API) calls for configuring the cloud-based deployment basedon the class definitions of the one or more classes; causing theplurality of API calls to be executed to configure the cloud-baseddeployment; identifying, based on the respective class definitions ofthe one or more classes, a plurality of data and functional componentsmodeled by the one or more classes, and one or more dependency andconnectivity relationships existing among the plurality of data orfunctional components, deriving a block diagram of a cloud-basedenvironment based on the identified plurality of data and functionalcomponents and the identified dependency and connectivity relationships;and representing trigger events for dynamic reconfiguration of thecloud-based environment in the block diagram.
 24. The system of claim23, wherein: the one or more classes include at least an existing baseclass and at least a customized class extended from the existing baseclass, the customized class inherits respective class parameters of theexisting base class, and the customized class modifies a value of atleast one of the class parameters inherited from the existing base classor includes at least one new class parameter not present in the existingbase class.
 25. The system of claim 23, wherein: the data or functionalcomponent modeled by each class is one of a virtual device supporting acloud-based environment, a service utilized in the cloud-basedenvironment, a software role performed by an installed application inthe cloud-based environment, a data package holding data to be usedduring deployment or operation of the cloud-based environment, or acombination of one or more thereof.
 26. The system of claim 23, wherein:the specification language supports at least one of dependency betweenclass definitions and connectivity between class definitions, and wherea definition dependency between a first class and a second classrepresents a deployment dependency between respective components modeledby the first and the second class, and where a value assignment linkingan instance of a second class to a class parameter of a first classrepresents a connectivity between respective components modeled by thefirst class and the second class.
 27. A system, comprising: one or moreprocessors; and memory having instructions stored thereon, theinstructions, when executed by the one or more processors, cause theprocessors to perform operations comprising: receiving a configurationspecification for configuring a cloud-based deployment, theconfiguration specification being written in a specification languageand requiring instantiation of respective class definitions of one ormore classes, each class modeling a respective data or functionalcomponent of the cloud-based deployment using a group of configurableclass parameters, and the respective class definition of each classrepresenting a requested state of the data or functional componentmodeled by the class; deriving a plurality of application programminginterface (API) calls for configuring the cloud-based deployment basedon the class definitions of the one or more classes; causing theplurality of API calls to be executed to configure the cloud-baseddeployment; identifying a plurality of cloud-based deployments eachhaving been carried out according to a respective configurationspecification written in the specification language; identifying atleast one base class whose class definition is used in multiple of theplurality of cloud-based deployments; monitoring respective performanceof each of the multiple of the plurality of cloud-based deployments; andcalculating a quality metric of the at least one base class based onaggregated performance of the multiple of the plurality of cloud-baseddeployments.
 28. The system of claim 27, wherein: the one or moreclasses include at least an existing base class and at least acustomized class extended from the existing base class, the customizedclass inherits respective class parameters of the existing base class,and the customized class modifies a value of at least one of the classparameters inherited from the existing base Class or includes at leastone new class parameter not present in the existing base class.
 29. Thesystem of claim 27, wherein: the data or functional component modeled byeach class is one of a virtual device supporting a cloud-basedenvironment, a service utilized in the cloud-based environment, asoftware role performed by an installed application in the cloud-basedenvironment, a data package holding data to be used during deployment oroperation of the cloud-based environment, or a combination of one ormore thereof.
 30. The system of claim 27, wherein: the specificationlanguage supports at least one of dependency between class definitionsand connectivity between class definitions, and where a definitiondependency between a first class and a second class represents adeployment dependency between respective components modeled by the firstand the second class, and where a value assignment linking an instanceof a second class to a class parameter of a first class represents aconnectivity between respective components modeled by the first classand the second class.